Psalm 52:8

But do you want me to show you from the Scriptures that trees or wood are given the name of individual virtues, which we mentioned above? I turn to the most wise Solomon as a witness when he said about wisdom, “The tree of life is for all who embrace it.” Therefore, if “wisdom is the tree of life,” without a doubt, there is another tree of prudence, another of knowledge and another of justice. For logically it is not said that only wisdom, of all the virtues, was worthy to be called “the tree of life” but that the other virtues did not receive names of similar sort. Therefore, “the trees of the field will give their fruit.” This is what I believe the blessed David also understood about himself when he said, “But I am as a fruitful olive tree in the house of God.” From this he clearly shows that the olive tree designates a just and holy person.

From what I have said already, we have learned what sort of end the one who is powerful in wickedness will obtain. But as for me, says David, since I have been taught this by the Holy Spirit, I would never be exalted over abundance of wealth, nor over the vanity of mortal life. For "vanity of vanities, all is vanity." But also, as I flee from the path of the one who is powerful in wickedness, I would not sharpen my tongue and my words for the destruction of others, but rather for the benefit of souls and the service of the words of salvation. And in my other actions too, I would become so flourishing and fruitful that my soul would be compared with an ever-flourishing and richly fruitful plant that has been planted in the house of God. For this reason, I say: "But I am like a fruitful olive tree in the house of God"—or, according to Symmachus' translation: "But I am like a flourishing olive tree in the house of God." For I did not turn away at all from the house of God; rather, after being planted inside it, as it were in God's own garden, and while enjoying the streams of the spring in the house of God, I became richly fruitful and ever-flourishing, in accordance with the pattern of the planted olive tree that has been received among the ever-flourishing [plants].

But observe that when David said this, he was not in Jerusalem, which the Jewish people considered to be the house of God—for it had not yet been built; and neither was he in the tabernacle built by Moses, which did still exist at that time among the Jews. For when he was fleeing from Saul, he passed his time among others—and yet he did indeed know that he had been planted in the house of God, since he understood the "house of God" to be the pious way of life. And because he was fruitful—not bearing bitter fruits but sweet fruits full of compassion,[36] he was rightly compared to a fruitful olive tree: the pattern signifying mercy towards one's neighbors and compassion toward all. Therefore, since he was overflowing with this sort of good things, he logically added, "I have put my hope in the mercy of God forever, even forever and ever."

You are being armed not with perishable but with spiritual weapons. The paradise in which you are being planted is the soul’s paradise, wherein you will be named with a name you did not have before. You were a catechumen till now, but now you are to be called believer. Henceforth you are transplanted among the olives of that paradise or are being grafted on a good olive tree being taken from a wild olive. You pass from sins to righteousness, from defilements to purity. You are becoming part of the holy Vine. If, then, you abide in the Vine, you grow into a fruitful branch; but if you do not so abide, you will be burned up in the fire. Let us therefore bring forth worthy fruit. For let not that come about, that there should happen to us what happened to the barren fig tree in the Gospel. Let not Jesus come in these days and utter the curse on the fruitless; instead may all of you say, “I am like a green olive tree in the house of God; my trust is in the tender mercy of God, forever and ever”; not a material olive tree but a spiritual and glorious one. It is God who plants and waters, but it is yours to bear fruit; God’s to bestow the gift, and yours to receive it and keep it forever. But do not esteem the gift lightly because it is given freely. Rather, receive it reverently and guard it with care.

But what shall they then say that shall laugh? "And over him they shall laugh; and shall say, Behold a man that has not set God for his helper" [Psalm 52:8]. See ye the body earthly! "As much as you shall have, so great shall you be," is a proverb of covetous men, of grasping men, of men oppressing the innocent, of men seizing upon other men's goods, of men denying things entrusted to their care. Of what sort is this proverb? "As much as you shall have, so great shall you be;" that is, as much as you shall have had of money, as much as you shall have gotten, by so much the more mighty shall you be. "Behold a man that has not set God for his helper, but has trusted in the multitude of his riches." Let not a poor man, one perchance that is evil, say, I am not of this body. For he has heard the Prophet saying, "He has trusted in the multitude of his riches:" immediately if he is poor, he heeds his rags, he has observed near him perchance a rich man among the people of God more richly apparelled, and he says in his heart, Of this man he speaks; does he speak of me? Do not thence except yourself, do not separate yourself, unless you shall have seen and feared, in order that you may hereafter laugh. For what does it profit you, if you dost want means, and you burn with cupidity? When our Lord Jesus Christ to that rich man that was grieved, and that was departing from Him, had said, "Go, sell all that you have, and give to the poor, and you shall have treasure in heaven, and come follow Me:" [Matthew 19:21] and great hopelessness for rich men foretold, so that He said, more easily could a camel pass through the eye of a needle, than a rich man enter into the kingdom of Heaven, [Matthew 19:24] were not immediately the disciples grieved, saying with themselves, "Who shall be able to be saved?" Therefore when they were saying, "Who shall be able to be saved?" did they think of the few rich men, did there escape them so great a multitude of poor men? Could they not say to themselves, If it is hard, aye an impossible thing, that rich men should enter into the kingdom of heaven, as it is impossible that a camel should enter through the eye of a needle, let all poor men enter into the kingdom of heaven, be the rich alone shut out? For how few are the rich men? But of poor men are thousands innumerable. For not the coats are we to look upon in the kingdom of heaven; but for every one's garment shall be reckoned the effulgence of righteousness: there shall be therefore poor men equal to Angels of God, clothed with the stoles of immortality, they shall shine as the sun in the kingdom of their Father: what reason is there for us about a few rich men to be concerned, or distressed? This thought not the Apostles; but when the Lord had spoken this, "It is easier for a camel to go through the eye of a needle, than for a rich man to enter into the kingdom of heaven:" they saying to themselves, "Who shall be able to be saved," meant what? Not means, but desires; for they saw even poor men themselves, even if not having money, yet to have covetousness. And that you may know, that not money in a rich man, but covetousness is condemned, attend to what I say; Thou observest that rich man standing near you, and perchance in him is money, and is not covetousness; in you is not money, and is covetousness. A poor man full of sores, full of woe, licked by dogs, having no help, having no morsel, not having perchance a mere garment, was borne by the Angels unto Abraham's bosom. [Luke 16:22] Ho! Being a poor man, are you glad now; for are even sores by you to be desired? Is not your patrimony soundness? There is not in this Lazarus the merit of poverty, but that of godliness. For you see who was borne up, you see not whither he was borne up. Who was borne up by Angels? A poor man, full of woe, full of sores. Whither was he borne up? Unto Abraham's bosom. Read the Scriptures, and you shall find Abraham to have been a rich man. [Genesis 13:2] In order that you may know, that not riches are blamed; Abraham had much gold, silver, cattle, household, was a rich man, and unto his bosom Lazarus, a poor man, was borne up. Unto bosom of rich man, poor man: are not rather both unto God rich men, both in cupidity poor men?...