Matthew 5:13

Salt is useful for so many purposes in human life! What need is there to speak about this? Now is the proper time to say why Jesus’ disciples are compared with salt. Salt preserves meats from decaying into stench and worms. It makes them edible for a longer period. They would not last through time and be found useful without salt. So also Christ’s disciples, standing in the way of the stench that comes from the sins of idolatry and fornication, support and hold together this whole earthly realm.

Jesus calls the faithful the “salt of the earth.” He warns them to persist in the strength of the power handed over to them. Otherwise, losing their own taste, they are unable to make anything else tasty. Deprived of salt’s taste, they are unable to make what is rotten edible. He warns them lest, cast forth from the church storerooms, they be trampled underfoot by the feet of passersby—the very feet of those they should have served with salt.

The salt of the earth, I suppose, seems at first like nothing special. So what did Jesus mean when he called the apostles the “salt of the earth”? We must look for the words’ appropriate meaning. Both the apostles’ task and the nature of salt itself will reveal this. The element of water and the element of fire are combined and united in salt. So ordinary salt, made for the use of the human race, imparts resistance to corruption to the meats on which it is sprinkled. And, of course, it is very apt to add the sensation of hidden flavor. Likewise the apostles are the preachers of surprising heavenly things and eternity. Like sowers, they sow immortality on all bodies on which their discourse has been sprinkled. They are perfected by the baptism of water and fire. So those who are to be salted with the power of gospel teaching have rightly been called the “salt of the earth.” They are right now being preserved to the end.

There may be here seen a propriety in our Lord's language which may be gathered by considering the Apostles' office, and the nature of salt. This, used as it is by men for almost every purpose, preserves from decay those bodies which are sprinkled with it; and in this, as well as in every sense of its flavour as a condiment, the parallel is most exact. The Apostles are preachers of heavenly things, and thus, as it were, salters with eternity; rightly called the salt of the earth, as by the virtue of their teaching, they, as it were, salt and preserve bodies for eternity.

And because man is ever liable to change, He therefore warns the Apostles, who have been entitled the salt of the earth, to continue stedfast in the might of the power committed to them, when He adds, If the salt have lost its savour, wherewith shall it be salted?

But if the doctors having become senseless, and having lost all the savour they once enjoyed, are unable to restore soundness to things corrupt, they are become useless; and are thenceforth fit only to be cast out and trodden by men.

Or even cast out from the Church's store rooms to be trodden under foot by those that walk.

He shows that those who have been educated for the faith and in heavenly wisdom ought to remain faithful and steadfast and not “lose their taste.” If they forsake the faith and divine wisdom, they either plunge headlong into heresy or return to the folly of unbelievers. And so Jesus says, “But if the salt loses its flavor, with what will it be seasoned?” For people of this sort, made tasteless by the devil’s treachery and having lost the grace of faith, are good for nothing. Though they once might have seasoned nonbelievers still foreign to the faith with the word of divine preaching, they instead showed themselves useless. Judas Iscariot deteriorated into this sort of useless salt. After he had rejected divine wisdom, having changed from an apostle into an apostate, he not only did not help others. He became wretched and useless even to himself.

When He had delivered to His Apostles such sublime precepts, so much greater than the precepts of the Law, that they might not be dismayed and say, How shall we be able to fulfil these things? He sooths their fears by mingling praises with His instructions, saying, Ye are the salt of the earth. This shows them how necessary were these precepts for them. Not for your own salvation merely, or for a single nation, but for the whole world is this doctrine committed to you. It is not for you then to flatter and deal smoothly with men, but, on the contrary, to be rough and biting as salt is. When for thus offending men by reproving them ye are reviled, rejoice; for this is the proper effect of salt to be harsh and grating to the depraved palate. Thus the evil-speaking of others will bring you no inconvenience, but will rather be a testimony of your firmness.

Now then, after giving them due exhortation, He refreshes them again with praises. As thus: the injunctions being high, and far surpassing those in the Old Testament; lest they should be disturbed and confounded, and say, How shall we be able to achieve these things? hear what He saith: Ye are the salt of the earth. Implying, that of absolute necessity He enjoins all this. For not for your own life apart, saith He, but for the whole world, shall your account be. For not to two cities, nor to ten or twenty, nor to a single nation am I sending you, as I sent the prophets; but to earth, and sea, and the whole world; and that in evil case. For by saying, Ye are the salt of the earth, He signified all human nature to have lost its savor, and to be decayed by our sins. For which cause, you see, He requires of them such virtues, as are most necessary and useful for the superintendence of the common sort. For first, the meek, and yielding, and merciful, and righteous, shuts not up his good deeds unto himself only, but also provides that these good fountains should run over for the benefit of others. And he again who is pure in heart, and a peacemaker, and is persecuted for the truth's sake; he again orders his way of life for the common good. Think not then, He saith, that ye are drawn on to ordinary conflicts, or that for some small matters you are to give account. Ye are the salt of the earth.

What then? did they restore the decayed? By no means; for neither is it possible to do any good to that which is already spoilt, by sprinkling it with salt. This therefore they did not. But rather, what things had been before restored, and committed to their charge, and freed from that ill savor, these they then salted, maintaining and preserving them in that freshness, which they had received of the Lord. For that men should be set free from the rottenness of their sins was the good work of Christ; but their not returning to it again any more was the object of these men's diligence and travail.

Seest thou how by degrees He indicates their superiority to the very prophets? in that He saith they are teachers, not of Palestine, but of the whole world; and not simply teachers, but awful ones too. For this is the marvellous thing, that not by flattering, nor soothing, but by sharply bracing them, as salt, even so they became dear to all men.

Now marvel not, saith He, if leaving all others, I discourse to you, and draw you on to so great dangers. For consider over how many cities, tribes, and nations, I am to send you to preside. Wherefore I would have you not only be prudent yourselves, but that you should also make others the same. And such persons have great need to be intelligent, in whom the salvation of the rest is at stake: they ought so much to abound in virtue, as to impart of the profit to others also. For if ye do not become such as this, ye will not suffice even for your own selves.

Be not then impatient, as though my sayings were too burdensome. For while it is possible for others who have lost their savor to return by your means, you, if you should come to this, will with yourselves destroy others also. So that in proportion as the matters are great, which ye have put into your hands, you need so much the greater diligence. Therefore He saith, But if the salt have lost its savor, wherewith shall it be salted? it is thenceforth good for nothing, but to be cast out, and to be trodden under foot of men.

For other men, though they fall never so often, may possibly obtain indulgence: but the teacher, should this happen to him, is deprived of all excuse, and will suffer the most extreme vengeance. Thus, lest at the words, When they shall revile you, and persecute you, and say all manner of evil against you, they should be too timid to go forth: He tells them, unless ye are prepared to combat with all this, ye have been chosen in vain. For it is not evil report that ye should fear, but lest ye should prove partners in dissimulation. For then, Ye will lose your savor, and be trodden under foot: but if ye continue sharply to brace them up, and then are evil spoken of, rejoice; for this is the very use of salt, to sting the corrupt, and make them smart. And so their censure follows of course, in no way harming you, but rather testifying your firmness. But if through fear of it you give up the earnestness that becomes you, ye will have to suffer much more grievously, being both evil spoken of, and despised by all. For this is the meaning of trodden under foot.

(Verse 13) You are the salt of the earth. The apostles are called salt because through them the entire human race is season

25 Quod si sal evannerit, in quo salietur? Si doctor erraverit, a quo alio doctore emendabitur?

It is worthless beyond nothingness, except to be thrown out and trampled by men. An example is taken from agriculture. For salt, indeed, as a condiment for foods, and for drying meats, it is necessary, but it has no other use. Certainly, we read in the Scriptures that certain cities, sown with the salt of the victors' anger, so that no sprout would arise in them (Judith IX). Therefore, let the doctors and bishops beware and see: the powerful endure torments powerfully (Wisdom VI, 7); and there is no remedy, but to lead the ruins of the ancestors to Tartarus.

Or, because by the Apostles the whole human race is seasoned.

That is, if the doctor have erred, by what other doctor shall he be corrected?

The illustration is taken from husbandry. Salt, though it be necessary for seasoning of meats and preserving flesh, has no further use. Indeed we read in Scripture of vanquished cities sown with salt by the victors, that nothing should thenceforth grow there.

Hence there follows most justly the statement, You are the salt of the earth; showing that those parties are to be judged insipid, who, either in the eager pursuit after abundance of earthly blessings, or through the dread of want, lose the eternal things which can neither be given nor taken away by men. But if the salt have lost its savour, wherewith shall it be salted? i.e., If you, by means of whom the nations in a measure are to be preserved [from corruption], through the dread of temporal persecutions shall lose the kingdom of heaven, where will be the men through whom error may be removed from you, since God has chosen you, in order that through you He might remove the error of others? Hence the savourless salt is good for nothing, but to be cast out, and trodden under foot of men. It is not therefore he who suffers persecution, but he who is rendered savourless by the fear of persecution, that is trodden under foot of men. For it is only one who is undermost that can be trodden under foot; but he is not undermost, who, however many things he may suffer in his body on the earth, yet has his heart fixed in heaven.

(ubi sup.) Persecuted He says generally, comprehending both reproaches and defamation of character.

(Serm. in Mont. i. 6.) If you by whom the nations are to be salted shall lose the kingdom of heaven through fear of temporal persecution, who are they by whom your error shall be corrected. Another copy has, If the salt have lost all sense, showing that they must be esteemed to have lost their sense, who cither pursuing abundance, or fearing lack of temporal goods, lose those which are eternal, and which men can neither give nor take away.

(ubi sup.) Not he that suffers persecution is trodden under foot of men, but he who through fear of persecution falls away. For we can tread only on what is below us; but he is no way below us, who however much he may suffer in the body, yet has his heart fixed in heaven.

He calls “salt” the frame of mind that is filled with the apostolic word, which is full of understanding. When it has been sown in our souls, it allows the word of wisdom to dwell in us. It has been compared with salt because of salt’s good taste and delightfulness. For without salt neither bread nor fish is edible. So too without the apostles’ understanding and instruction, every soul is dull and unwholesome and unpleasant to God.

A doctor when he is adorned with all the preceding virtues, then is like good salt, and his whole people are salted by seeing and hearing him.

Moreover, salt is changed into another kind of substance by three means, water, the heat of the sun, and the breath of the wind. Thus Apostolical men also were changed into spiritual regeneration by the water of baptism, the heat of love, and the breath of the Holy Spirit. That heavenly wisdom also, which the Apostles preached, dries up the humours of carnal works, removes the foulness and putrefaction of evil conversation, kills the work of lustful thoughts, and also that worm of which it is said their worm dieth not. (Is. 66:24.)

The Apostles are the salt of the earth, that is, of worldly men who are called the earth, because they love this earth.

It should be known, that in the Old Testament no sacrifice was offered to God unless it were first sprinkled with salt, for none can present an acceptable sacrifice to God without the flavour of heavenly wisdom.

Therefore we must consider that, insofar as each person is able, insofar as he is capable, he should strive to impress upon the Church entrusted to him both the terror of the coming judgment and the sweetness of the kingdom. And he who cannot admonish everyone at once with one and the same voice of exhortation ought to instruct individuals as much as he can, to edify them through private conversations, and to seek fruit in the hearts of his children through simple exhortation. For we must continually weigh what is said to the holy apostles, and through the apostles to us: You are the salt of the earth. If therefore we are salt, we ought to season the minds of the faithful. You then, who are shepherds, consider that you are feeding God's animals. Concerning these animals indeed it is said to God through the Psalmist: Your animals shall dwell in it. And we often see that a block of salt is set before brute animals, so that they may lick that same block of salt and be improved. Therefore, like a block of salt among brute animals, so should the priest be among the people. For the priest must take care what he says to each person, how he admonishes each one, so that whoever is joined to the priest may be seasoned with the taste of eternal life, as if from the touch of salt. For we are not the salt of the earth if we do not season the hearts of our hearers. Indeed, he truly bestows this seasoning upon his neighbor who does not withhold the word of preaching.

If therefore the people are the food of God, the priests ought to have been the seasoning of the food. But because while we cease from the practice of prayer and holy instruction, the salt has become tasteless; it cannot season the food of God, and therefore it is not taken up by the Creator, because through our prevailing foolishness it is not seasoned at all.

The prophets were sent to one race only, but you are the salt of the whole earth. By your teachings and reproofs you act as an astringent upon the slack and the indolent, so that they will not breed the worms that never die. So do not desist from your astringent reproofs, even if you are reviled or persecuted. Therefore He says:

For if the teacher has become insipid, that is, if he does not give astringent reproofs, but has become soft and lax, "wherewith shall it be salted?" that is, how can this be corrected? So from then on he is cast out from the rank of teacher and is trodden under foot, that is, despised.

(ap. Anselm.) When then they who are the heads have fallen away, they are fit for no use but to be cast out from the office of teacher.