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Translation
King James Version
And they will deceive every one his neighbour, and will not speak the truth: they have taught their tongue to speak lies, and weary themselves to commit iniquity.
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KJV (with Strong's)
And they will deceive H2048 every one H376 his neighbour H7453, and will not speak H1696 the truth H571: they have taught H3925 their tongue H3956 to speak H1696 lies H8267, and weary H3811 themselves to commit iniquity H5753.
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Complete Jewish Bible
Everyone deceives his neighbor, no one speaks the truth; they have taught their tongues to lie, they wear themselves out with sinning.
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Berean Standard Bible
Each one betrays his friend; no one tells the truth. They have taught their tongues to lie; they wear themselves out committing iniquity.
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American Standard Version
And they will deceive every one his neighbor, and will not speak the truth: they have taught their tongue to speak lies; they weary themselves to commit iniquity.
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World English Bible Messianic
They will deceive everyone his neighbor, and will not speak the truth: they have taught their tongue to speak lies; they weary themselves to commit iniquity.
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Geneva Bible (1599)
And euery one wil deceiue his friende, and wil not speake the trueth: for they haue taught their tongues to speake lies, and take great paynes to do wickedly.
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Young's Literal Translation
And each at his friend they mock, And truth they do not speak, They taught their tongue to speak falsehood, To commit iniquity they have laboured.
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Study This Verse

SUMMARY

Jeremiah 9:5 vividly portrays the profound moral and spiritual decay within Judah, depicting a society where deceit has become the prevailing norm, truth is actively suppressed, and the pursuit of wickedness is an exhausting, cultivated endeavor. This verse encapsulates the prophet's lament over a people so steeped in falsehood that they have trained themselves in dishonesty, demonstrating an intense and deliberate commitment to iniquity rather than to God's righteous ways, thus setting the stage for divine judgment.

CONTEXT

  • Literary Context: Jeremiah 9:5 is embedded within a powerful lament (Jeremiah 9:1-11) where the prophet expresses deep anguish over the pervasive sin of his people. This section immediately follows a strong denunciation of Judah's idolatry and false worship (Jeremiah 7-8), particularly their reliance on the Temple while engaging in widespread injustice and immorality. The verses preceding 9:5 describe a land filled with "adulterers" and "treacherous dealers" (Jeremiah 9:2), setting the stage for the specific indictment of deceit and untruthfulness. The prophet's sorrow in Jeremiah 9:1 is a direct response to the spiritual depravity described in verses like 9:5, highlighting the prophet's personal agony over the nation's impending judgment.
  • Historical & Cultural Context: Jeremiah prophesied during a tumultuous period in Judah's history, spanning the reigns of several kings from Josiah to Zedekiah (c. 627-586 BC). This era was marked by political instability, the decline of Assyrian power, the rise of Babylon, and the looming threat of invasion. Spiritually, Judah had largely abandoned the covenant with Yahweh, embracing idolatry and syncretism, often adopting the practices of surrounding Canaanite cultures. Socially, this spiritual apostasy manifested in widespread corruption, injustice, and a breakdown of trust within the community. The "neighbor" in this context refers to fellow Israelites, implying a betrayal of the communal bonds established by the Mosaic Law, which emphasized truthfulness and justice (e.g., Exodus 20:16).
  • Key Themes: This verse powerfully contributes to several overarching themes in Jeremiah. It underscores the theme of Pervasive Sin and Corruption, showing that sin was not isolated but deeply ingrained in the fabric of society, affecting every individual interaction. It highlights the Rejection of Truth and Covenant Faithfulness, as the people actively chose falsehood over the truth demanded by their covenant God, who is himself the God of truth (Deuteronomy 32:4). The phrase "taught their tongue to speak lies" emphasizes the theme of Intentional and Cultivated Wickedness, indicating that sin was not merely accidental but a deliberate, practiced skill. Finally, "weary themselves to commit iniquity" speaks to the Energetic Pursuit of Evil, revealing a profound dedication to unrighteousness that tragically contrasts with the energy due to God, foreshadowing the inevitable Divine Judgment that would fall upon Judah for their unrepentant rebellion, as detailed throughout Jeremiah's prophecies.

EXPOSITION AND ANALYSIS

Key Word Analysis

  • Deceive (Hebrew, hâthal', H2048): This primitive root (H2048) means "to deride" or, by implication, "to cheat." It conveys a sense of mockery and trickery, suggesting that the act of deception was not merely a passive withholding of truth but an active, often scornful, manipulation of others. In Jeremiah 9:5, it indicates a pervasive culture where individuals actively sought to outwit and betray their "neighbor" (H7453, rêaʻ), eroding the very foundation of communal trust.
  • Taught (Hebrew, lâmad', H3925): This root (H3925) properly means "to goad" or "to teach," implying a process of instruction, training, or becoming accustomed to something. The use of "taught" here is significant; it indicates that lying was not an accidental or occasional failing but a deliberate, learned behavior. The people had actively disciplined their tongues, honing their ability to fabricate falsehoods, signifying a profound and intentional moral perversion.
  • Weary (Hebrew, lâʼâh', H3811): Meaning "to tire" or "to be disgusted" (H3811), this word describes a state of exhaustion or fatigue. When applied to "commit iniquity," it paints a striking picture: the people expend immense effort and energy in their pursuit of wrongdoing. This is not passive sin, but an active, laborious, and even exhausting dedication to perpetrating evil, revealing a deep-seated commitment to unrighteousness that consumes their vitality.

Verse Breakdown

  • "And they will deceive every one his neighbour": This opening clause immediately establishes the pervasive nature of deceit. "Every one" (H376, ʼîysh) emphasizes the universality of this practice, indicating that dishonesty was not limited to a few corrupt individuals but was characteristic of the entire society. The target, "his neighbour" (H7453, rêaʻ), underscores the breakdown of trust within the community, where those who should be allies and confidantes are instead objects of manipulation.
  • "and will not speak the truth": This phrase clarifies the nature of the deceit—it is an active refusal to engage with or utter what is true (H571, ʼemeth). It's not just a failure to be honest, but a deliberate choice to withhold or distort reality. This highlights a fundamental departure from God's character, who is the embodiment of truth, and a rejection of the covenantal demands for integrity.
  • "they have taught their tongue to speak lies": This is a powerful and chilling indictment. The "tongue" (H3956, lâshôwn) is the instrument of speech, and the verb "taught" (H3925, lâmad) implies intentional training and mastery. This suggests that lying was not merely a habit but a cultivated skill, a deliberate discipline. The "lies" (H8267, sheqer) are untruths, shams, and falsehoods, indicating that their speech was systematically divorced from reality and designed to mislead.
  • "[and] weary themselves to commit iniquity": This final clause reveals the intensity and dedication with which the people pursued wrongdoing. To "weary themselves" (H3811, lâʼâh) implies expending significant effort and energy. "To commit iniquity" (H5753, ʻâvâh) means to act perversely or wickedly. The combination paints a picture of people who are not just passively sinning but are actively, even strenuously, toiling in the service of evil, demonstrating a profound and exhausting commitment to unrighteousness.

Literary Devices

Jeremiah 9:5 employs several potent literary devices to convey its message. Hyperbole is evident in the sweeping statement "every one his neighbour," emphasizing the widespread and universal nature of the corruption; though perhaps not literally every single person, it conveys the overwhelming societal trend. The phrase "taught their tongue to speak lies" uses Personification by attributing the act of learning and teaching to the tongue, highlighting the intentional and disciplined nature of their deceit. This also functions as a Metaphor for the ingrained habit and mastery of falsehood. Furthermore, there is a stark Irony in the idea of "wearying themselves to commit iniquity." Instead of expending energy for good, for God, or for productive labor, they exhaust themselves in destructive, self-defeating wickedness, underscoring the tragic misdirection of their human will and effort.

THEOLOGICAL AND THEMATIC CONNECTIONS

Jeremiah 9:5 stands as a stark theological commentary on the nature of sin and humanity's propensity for rebellion against a holy God. It reveals that sin is not merely a passive failing but can be an active, cultivated, and even laborious pursuit, fundamentally distorting human relationships and rejecting divine truth. The verse underscores God's unwavering commitment to truth and righteousness, contrasting sharply with humanity's fallen state. It highlights the destructive power of deceit, which erodes trust, corrupts society, and ultimately separates individuals from God, who is the source of all truth and integrity. The prophet's lament reflects God's own sorrow over His people's persistent unfaithfulness and their preference for falsehood over the life-giving truth of His covenant.

REFLECTION AND APPLICATION

Jeremiah 9:5 serves as a profound mirror for self-examination and societal critique in any age. It challenges us to consider the subtle and overt ways in which deceit can permeate our lives and communities. Are we, like ancient Judah, "teaching our tongues to speak lies" through gossip, exaggeration, half-truths, or outright falsehoods in our personal and professional interactions? The concept of "wearying themselves to commit iniquity" is particularly convicting, prompting us to reflect on where we expend our energy. Do we exhaust ourselves in pursuits that are ultimately self-serving, destructive, or contrary to God's will, or are we actively and joyfully pursuing righteousness and truth? This verse calls believers to a radical commitment to integrity, to be people whose words are reliable and whose actions reflect the character of God. It reminds us that cultivating truthfulness and actively pursuing righteousness are not passive endeavors but require intentional effort and a deliberate turning away from the insidious allure of deceit and sin.

Questions for Reflection

  • In what areas of my life might I be "teaching my tongue to speak lies," perhaps subtly or habitually?
  • Where am I expending significant energy and effort? Is it in alignment with God's will, or am I "wearying myself to commit iniquity" in some form?
  • How can I actively cultivate a greater commitment to truth and integrity in my daily interactions, reflecting God's character?
  • What is the impact of widespread deceit on my community or society, and how can I be an agent of truth and trust?

FAQ

What does it mean that they "taught their tongue to speak lies"?

Answer: This phrase, "they have taught their tongue to speak lies," signifies that dishonesty was not an accidental or occasional slip but a deliberate, cultivated, and practiced skill. It implies that the people had actively trained themselves in the art of deception, becoming proficient in fabricating falsehoods. This suggests a deep-seated moral corruption where lying was not merely a habit but a chosen discipline, reflecting a profound intentionality in their sin. It stands in stark contrast to the divine expectation for truthfulness and integrity, as seen in passages like Proverbs 6:16-19.

How does "weary themselves to commit iniquity" illustrate the nature of their sin?

Answer: The phrase "weary themselves to commit iniquity" powerfully illustrates the intensity and dedication with which the people pursued wrongdoing. It suggests that sin was not a passive or effortless act but required significant exertion, effort, and energy. Instead of directing their strength towards righteous endeavors or serving God, they expended their vitality in perpetrating evil. This reveals a profound and active commitment to unrighteousness, demonstrating that their hearts were fully engaged in rebellion, even to the point of exhaustion, rather than seeking the path of life and truth found in God's ways, as described in Psalm 1:1-2.

CHRIST-CENTERED FULFILLMENT

Jeremiah 9:5, with its grim portrayal of humanity's deep-seated deceit and laborious commitment to sin, finds its ultimate answer and fulfillment in Jesus Christ. The pervasive lies and the active pursuit of iniquity described here underscore humanity's desperate need for a Savior who embodies truth and can break the power of sin. Jesus declared Himself to be "the way, the truth, and the life" (John 14:6), standing in stark contrast to the falsehood that permeated Judah. While humanity "taught their tongue to speak lies," Christ's words were always pure truth, and He never "committed sin, nor was deceit found in His mouth" (1 Peter 2:22). The "weariness" of committing iniquity points to the futility and burden of a life lived apart from God; Christ, however, invites those who are "weary and burdened" to come to Him for rest (Matthew 11:28). Through His atoning sacrifice on the cross, Jesus bore the full weight of our iniquity, offering redemption from the very sins Jeremiah lamented. His resurrection empowers believers to "put off falsehood and speak truthfully to your neighbor" (Ephesians 4:25), enabling a new life where energy is directed not towards sin, but towards righteousness and the glory of God, fulfilling the longing for truth and integrity that the human heart, corrupted by sin, could never achieve on its own.

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Commentary on Jeremiah 9 verses 1–11

I. II. Main points1. 2. Sub-points(1.) (2.) Details

The prophet, being commissioned both to foretel the destruction coming upon Judah and Jerusalem and to point out the sin for which that destruction was brought upon them, here, as elsewhere, speaks of both very feelingly: what he said of both came from the heart, and therefore one would have thought it would reach to the heart.

I. He abandons himself to sorrow in consideration of the calamitous condition of his people, which he sadly laments, a one that preferred Jerusalem before his chief joy and her grievances before his chief sorrows.

1.He laments the slaughter of the persons, the blood shed and the lives lost (Jer 9:1): "O that my head were waters, quite melted and dissolved with grief, that so my eyes might be fountains of tears, weeping abundantly, continually, and without intermission, still sending forth fresh floods of tears as there still occur fresh occasions for them!" The same word in Hebrew signifies both the eye and a fountain, as if in this land of sorrows our eyes were designed rather for weeping than seeing. Jeremiah wept much, and yet wished he could weep more, that he might affect a stupid people and rouse them to a due sense of the hand of God gone out against them. Note, It becomes us, while we are here in this vale of tears, to conform to the temper of the climate and to sow in tears. Blessed are those that mourn, for they shall be comforted hereafter; but let them expect that while they are here the clouds will still return after the rain. While we find our hearts such fountains of sin, it is fit that our eyes should be fountains of tears. But Jeremiah's grief here is upon the public account: he would weep day and night, not so much for the death of his own near relations, but for the slain of the daughter of his people, the multitudes of his countrymen that fell by the sword of war. Note, When we hear of the numbers of the slain in great battles and sieges we ought to be much affected with the intelligence, and not to make a light matter of it; yea, though they be not of the daughter of our people, for, whatever people they are of, they are of the same human nature with us, and there are so many precious lives lost, as dear to them as ours to us, and so many precious souls gone into eternity.

2.He laments the desolations of the country. This he brings in (v. 10), for impassioned mourners are not often very methodical in their discourses: "Not only for the towns and cities, but for the mountains, will I take up a weeping and wailing" (not barren mountains, but the fruitful hills with which Judea abounded), and for the habitations of the wilderness, or rather the pastures of the plain, that used to be clothed with flocks or covered over with corn, and a goodly sight it was; but now they are burnt up by the Chaldean army (which, according to the custom of war, destroyed to the custom of war, destroyed the forage and carried off all the cattle), so that no one dares to pass through them, for fear of meeting with some parties of the enemy, no one cares to pass through them, every thing looks so melancholy and frightful, no one has any business to pass through them, for they hear not the voice of the cattle there as usual, the bleating of the sheep and the lowing of the oxen, that grateful music to the owners; nay, both the fowl of the heavens and the beasts have fled. either frightened away by the rude noises and terrible fires which the enemies make, or forced away because there is no subsistence for them. Note, God has many ways of turning a fruitful land into barrenness for the wickedness of those that dwell therein; and the havoc war makes in a country cannot but be for a lamentation to all tender spirits, for it is a tragedy which destroys the stage it is acted on.

II. He abandons himself to solitude, in consideration of the scandalous character and conduct of his people. Though he dwells in Judah where God is known, in Salem where his tabernacle is, yet he is ready to cry out, Woe is me that I sojourn in Mesech! Psa 120:5. While all his neighbours are fleeing to the defenced cities, and Jerusalem especially, in dread of the enemies' rage (Jer 4:5, Jer 4:6) he is contriving to retire into some desert, in detestation of his people's sin (Jer 9:2): "O that I had in the wilderness a lodging-place of wayfaring men, such a lonely cottage to dwell in as they have in the deserts of Arabia, which are uninhabited, for travellers to repose themselves in, that I might leave my people and go from them!" Not only because of the ill usage they gave him (he would rather venture himself among the wild beasts of the desert than among such treacherous barbarous people), but principally because his righteous soul was vexed from day to day, as Lot's was in Sodom, with the wickedness of their conversation, Pe2 2:7, Pe2 2:8. This does not imply any intention or resolution that he had thus to retire. God had cut him out work among them, which he must not quit for his own ease. We must not go out of the world, bad as it is, before our time. If he could not reform them, he could bear a testimony against them; if he could not do good to many, yet he might to some. but it intimates the temptation he was in to leave them, involves a threatening that they should be deprived of his ministry, and especially expresses the holy indignation he had against their abominable wickedness, which continued notwithstanding all the pains he had taken with them to reclaim them. It made him even weary of his life to see them dishonouring God as they did and destroying themselves. Time was when the place which God had chosen to put his name there was the desire and delight of good men. David, in a wilderness, longed to be again in the courts of God's house; but now Jeremiah, in the courts of God's house (for there he was when he said this), wishes himself in a wilderness. Those have made themselves very miserable that have made God's people and ministers weary of them and willing to get from them. Now, to justify his willingness to leave them, he shows,

1.What he himself had observed among them.

(1.)He would not think of leaving them because they were poor and in distress, but because they were wicked. [1.] They were filthy: They are all adulterers, that is, the generality of them are, Jer 5:8. They all either practised this sin or connived at those that did. Lewdness and uncleanness constituted that crying sin of Sodom at which righteous Lot was vexed in soul, and it is a sin that renders men loathsome in the eyes of God and all good men; it makes men an abomination. [2.] They were false. This is the sin that is most enlarged upon here. Those that had been unfaithful to their God were so to one another, and it was a part of their punishment as well as their sin, for even those that love to cheat, yet hate to be cheated. First, Go into their solemn meetings for the exercises of religion, for the administration of justice, or for commerce - to church, to court, or to the exchange - and they are an assembly of treacherous men; they are so by consent, they strengthen one another's hands in doing any thing that is perfidious. There they will cheat deliberately and industriously, with design, with a malicious design, for (Jer 9:3) they bend their tongues, like their bow, for lies, with a great deal of craft; their tongues are fitted for lying, as a bow that is bent is for shooting, and are as constantly used for that purpose. Their tongue turns as naturally to a lie as the bow to the strong. But they are not valiant for the truth upon the earth. Their tongues are like a bow strung, with which they might do good service if they would use the art and resolution which they are so much masters of in the cause of truth; but they will not do so. They appear not in defence of the truths of God, which were delivered to them by the prophets; but even those that could not deny them to be truths were content to see them run down. In the administration of justice they have not courage to stand by an honest cause that has truth on its side, if greatness and power be on the other side. Those that will be faithful to the truth must be valiant for it, and not be daunted by the opposition given to it, nor fear the face of man. They are not valiant for the truth in the land, the land which has truth for the glory of it. Truth has fallen in the land, and they dare not lend a hand to help it up, Isa 59:14, Isa 59:15. We must answer, another day, not only for our enmity in opposing truth, but for our cowardice in defending it. Secondly, Go into their families, and you will find they will cheat their own brethren (every brother will utterly supplant); they will trip up one another's heels if they can, for they lie at the catch to seek all advantages against those they hope to make a hand of. Jacob had his name from supplanting; it is the word here used; they followed him in his name, but not in his true character, without guile. So very false are they that you cannot trust in a brother, but must stand as much upon your guard as if you were dealing with a stranger, with a Canaanite that has balances of deceit in his hand. Things have come to an ill pass indeed when a man cannot put confidence in his own brother. Thirdly, Go into company and observe both their commerce and their conversation, and you will find there is nothing of sincerity or common honesty among them. Nec hospes ab hospite tutus - The host and the guest are in danger from each other. The best advice a wise man can give you is to take heed every one of his neighbour, nay, of his friend (so some read it), of him whom he has befriended and who pretends friendship to him. No man thinks himself bound to be either grateful or sincere. Take them in their conversation and every neighbour will walk with slander; they care not what ill they say one of another, though ever so false; that way that the slander goes they will go; they will walk with it. They will walk about from house to house too, carrying slanders along with them, all the ill-natured stories they can pick up or invent to make mischief. Take them in their trading and bargaining, and they will deceive every one his neighbour, will say any thing, though they know it to be false, for their own advantage. Nay, they will lie for lying sake, to keep their tongues in use to it, for they will not speak the truth, but will tell a deliberate lie and laugh at it when they have done.

(2.)That which aggravates the sin on this false and lying generation is, [1.] That they are ingenious to sin: They have taught their tongue to speak lies, implying that through the reluctances of natural conscience they found it difficult to bring themselves to it. Their tongue would have spoken truth, but they taught it to speak lies, and by degrees have made themselves masters of the art of lying, and have got such a habit of it that use has made it a second nature to them. They learnt it when they were young (for the wicked are estranged from the womb, speaking lies, Psa 58:3), and now they have grown dexterous at it. [2.] That they are industrious to sin: They weary themselves to commit iniquity; they put a force upon their consciences to bring themselves to it; they tire out their convictions by offering them continual violence, and they take a great deal of pains, till they have even spent themselves in bringing about their malicious designs. They are wearied with their sinful pursuits and yet not weary of them. The service of sin is a perfect drudgery; men run themselves out of breath in it, and put themselves to a great deal of toil to damn their own souls. [3.] That they grow worse and worse (Jer 9:3): They proceed from evil to evil, from one sin to another, from one degree of sin to another. They began with less sins. Nemo repente fit turpissimus - No one reaches the height of vice at once. They began with equivocating and bantering, but at last came to downright lying. And they are now proceeding to greater sins yet, for they know not me, saith the Lord; and where men have no knowledge of God, or no consideration of what they have known of him, what good can be expected from them? Men's ignorance of God is the cause of all their ill conduct one towards another.

2.The prophet shows what God had informed him of their wickedness, and what he had determined against them.

(1.)God had marked their sin. He could tell the prophet (and he speaks of it with compassion) what sort of people they were that he had to deal with. I know thy works, and where thou dwellest, Rev 2:13. So here (Jer 9:6): "Thy habitation is in the midst of deceit, all about thee are addicted to it; therefore stand upon thy guard." If all men are liars, it concerns us to beware of men,. and to be wise as serpents. They are deceitful men; therefore there is little hope of thy doing any good among them; for, make things ever so plain, they have some trick or other wherewith to shuffle off their convictions. This charge is enlarged upon, Jer 9:8. Their tongue was a bow bent (Jer 9:3), plotting and preparing mischief; here it is an arrow shot out, putting in execution what they had projected. It is as a slaying arrow (so some readings of the original have it); their tongue has been to many an instrument of death. They speak peaceably to their neighbours, against whom they are at the same time lying in wait; as Joab kissed Abner when he was about to kill him, and Cain, that he might not be suspected of any ill design, talked with his brother, freely and familiarly. Note, Fair words, when they are not attended with good intentions, are despicable, but, when they are intended as a cloak and cover for wicked intentions they are abominable. While they did all this injury to one another they put a great contempt upon God: "Not only they know not me, but (Jer 9:6) through deceit, through the delusions of the false prophets, they refuse to know me; they are so cheated into a good opinion of their own ways, the ways of their own heart, that they desire not the knowledge of my ways." Or, "They are so wedded to this sinful course which they are in, and so bewitched with that, and its gains, that they will by no means admit the knowledge of God, because that would be a check upon them in their sins." This is the ruin of sinners: they might be taught the good knowledge of the Lord and they will not learn it; and where no knowledge of God is, what good can be expected? Hos 4:1.

(2.)He had marked them for ruin, Jer 9:7, Jer 9:9, Jer 9:11. Those that will not know God as their lawgiver shall be made to know him as their judge. God determines here to bring his judgments upon them, for the refining of some and the ruining of the rest. [1.] Some shall be refined (Jer 9:7): "Because they are thus corrupt, behold I will melt them and try them, will bring them into trouble and see what that will do towards bringing them to repentance, whether the furnace of affliction will purify them from their dross, and whether, when they are melted, they will be new-cast in a better mould." He will make trial of less afflictions before he brings upon them utter destruction; for he desires not the death of sinners. They shall not be rejected as reprobate silver till the founder has melted in vain, Jer 6:29, Jer 6:30. For how shall I do for the daughter of my people? He speaks as one consulting with himself what to do with them that might be for the best, and as one that could not find in his heart to cast them off and give them up to ruin till he had first tried all means likely to bring them to repentance. Or, "How else shall I do for them? They have grown so very corrupt that there is no other way with them but to put them into the furnace; what other course can I take with them? Isa 5:4, Isa 5:5. It is the daughter of my people, and I must do something to vindicate my own honour, which will be reflected upon if I connive at their wickedness. I must do something to reduce and reform them." A parent corrects his own children because they are his own. Note, When God afflicts his people, it is with a gracious design to mollify and reform them; it is but when need is and when he knows it is the best method he can use. [2.] The rest shall be ruined (Jer 9:9): Shall I not visit for these things? Fraud and falsehood are sins which God hates and which he will reckon for. "Shall not my soul be avenged on such a nation as this, that is so universally corrupt, and, by its impudence in sin, even dares and defies divine vengeance? The sentence is passed, the decree has gone forth (Jer 9:11): I will make Jerusalem heaps of rubbish, and lay it in such ruins that it shall be fit for nothing but to be a den of dragons; and the cities of Judah shall be a desolation." God makes them so, for he gives the enemy warrant and power to do it: but why is the holy city made a heap? The answer is ready, Because it has become an unholy one?

Matthew Henry (1662–1714) — Commentary on the Whole Bible. This section covers verses 1–11. Public domain.
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JeromeAD 420
Commentary on Jeremiah
(Verse 4 and following) Let each person guard themselves from their neighbor, and let them not have trust in any brother, for every brother will deceive and every friend will act deceitfully; and a man will mock his brother, and they will not speak the truth. For they have taught their tongue to speak lies (or their tongue has learned to speak lies), in order to act wickedly, they have labored (or acted unjustly) and have not ceased from turning away. Your dwelling is in the midst of deceit, in deceit (or usury upon usury, and deceit upon deceit); they refused (or did not want) to know me, says the Lord. This place should be used in times of persecution and distress, when either faith is rare or non-existent: when neither brother nor neighbor can be trusted, and the enemies of a man are those of his own household (Mich. 7): when, according to the Gospel, the father will betray the son, and the son the father, and two will be divided into three, and three into two. And what it implies, They have taught their tongue to speak falsehood, or their tongue has learned to speak falsehood (Matt. X), shows that the habit of lying is somehow turned into nature: and they diligently act so that they may do wicked things. And what follows, Your dwelling is in the midst of deceit, in deceit, is specifically directed to the Prophet, that he dwells among a lying people; or as the Seventy translated: Usury upon usury, and deceit upon deceit: and that they increase their crimes daily, and have no remorse for their previous actions, but rather accumulate past offenses with new ones. They do these things, with all zeal, so that they may not know the Lord, who did not command these things to be done.
Augustine of HippoAD 430
SERMON 16A.2
What do we do with such a useful member? With it we pray to God. With it we make amends. With it we utter praises. With it we sing with one voice in harmony to God. With it every day we show ourselves kind and considerate when we talk to others or give them advice. What are we doing at this very moment? This very tongue of mine is performing you a service. What are we to do, in order not to transgress with the tongue? Especially as it is written, "Death and life are in the hands of the tongue," and again it is written, "I saw many fall by the edge of the sword, but not like those who fell by the tongue." Again it is written, "And the tongue is established among our members, as something that defiles our whole body." And yet again the same Lord says, "They have taught their tongues to speak lies."
John CassianAD 435
CONFERENCE 3:23.1
Everyone is so inflamed by the love of sin and desire to carry out what they like, that they look out with watchful care for an opportunity to commit wickedness. They are afraid of being too slow to enjoy their lusts, even glorying in their shame and the great number of their crimes, as the apostle says in censure. They seek credit for themselves out of their own confusion. The prophet Jeremiah also maintains that they commit their heinous crimes not only willingly and with ease of heart and body but with laborious efforts to such an extent that they come to toil to carry them out. They are even impeded from their deadly quest of sin by the burdensome effort the actualizing of their evil desires requires, as he says: “They have labored to do wickedly.”
John CassianAD 435
CONFERENCE 2:16.18
“For every brother will utterly supplant, and every friend will walk deceitfully. And a man shall mock his brother, and they will not speak the truth, for they have bent their tongue like a bow for lies and not for truth.” But often a pretended patience excites to anger more keenly than words, and a spiteful silence exceeds the most awful insults in words. The wounds of enemies are more easily borne than the deceitful blandishment of mockers, as is well said by the prophet.
Gregory the DialogistAD 604
PASTORAL RULE 3:11
The insincere are to be admonished to learn how heavy is the labor of deception. They endure it with guilt. They are afraid of being found out. They are ever seeking dishonest defenses. They are agitated by fearful suspicions. But there is nothing safer to defend than sincerity, nothing easier to say than truth. For, when obliged to defend its deceit, the heart is wearied with hard labor. For it is written, “The labor of their own lips shall cover them.” For what now fills them then covers them, since it then presses down with sharp retribution one whose soul it now elevates with a mild uneasiness. It is said through Jeremiah, “They have taught their tongue to speak lies, and weary themselves to commit iniquity.” Said more plainly: “They who might have been friends of truth without labor, labor to sin.”
Source: Quotations drawn from early Church Fathers and historical Christian theologians (AD 100–1500). Some quotes address the surrounding passage context rather than this verse alone.
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