Psalms 37:21

Saul was like that, ever the object of kindness at the hands of the divine David but reluctant to repay kindness with kindness; blessed David …, in imitation of his Lord, who makes his sun rise on wicked and good, continued showing kindness.

"The wicked borroweth, and payeth not again." He receiveth, and will not repay. What is it he will not repay? Thanksgiving. For what is it that God would have of thee, what doth He require of thee, except that He may do thee good? And how great are the benefits which the sinner hath received, and which he will not repay! He hath received the gift of being; he hath received the gift of being a man; and of a being highly distinguished above the brutes; he hath received the form of a body, and the distinction of the senses in the body, eyes for seeing, ears for hearing, the nostrils for smelling, the palate for tasting, the hands for touching, and the feet for walking; and even the very health and soundness of the body. But up to this point we have these things in common even with the brute; he hath received yet more than this; a mind capable of understanding, capable of Truth, capable of distinguishing right from wrong; capable of seeking after, of longing for, its Creator, of praising Him, and fixing itself upon Him. All this the wicked man hath received as well as others; but by not living well, he fails to repay that which he owes. Thus it is, "the wicked borroweth, and payeth not again:" he will not requite Him from whom he hath received; he will not return thanks; nay, he will even render evil for good, blasphemies, murmuring against God, indignation. Thus it is that he "borroweth, and payeth not again; but the righteous showeth mercy, and lendeth" (ver. 21). The one therefore hath nothing; the other hath. See, on the one side, destitution: see, on the other, wealth. The one receiveth and "payeth not again:" the "other showeth mercy, and lendeth:" and he hath more than enough. What if he is poor? Even so he is rich; do you but look at his riches with the eyes of Religion. For thou lookest at the empty chest; but dost not look at the conscience, that is full of God....

(Verse 21.) The sinner borrows and does not repay; but the righteous shows mercy and gives. This also applies to the person of Paul, because the righteous shows mercy and gives. See how he divides the Lord's words, see how he lends the Lord's silver. He received one mina and returned two; he received two and returned four; he received five and returned ten. He did not tie up in a handkerchief what he had received, but he spent it on moneylenders; and what he had spent, he received back with interest. And so he freed the one receiving from the greatest sin, lest the money of the Lord would perish with him; and he redeemed himself to be appointed over ten cities. Look in the letters for which are the ten cities that he mentions; although the apostles are not bound by a prescribed number, to whom it was said: Go throughout the whole world and preach the Gospel to every creature (Mark 16:15). Therefore, he distributed the money of the Lord from Jerusalem through the East, Illyricum, and Italy. And lest anyone think that he was lending his own money, he testified that it was the Lord's money, saying: But to those who are joined in marriage, I give this command (not I, but the Lord): A wife must not separate from her husband (1 Corinthians 7:10). And elsewhere: Do you seek proof that Christ is speaking in me? (2 Corinthians 13:3). Finally, the king himself said this, in which he represents the Lord: You should have entrusted my money to the bankers. He said, 'my money', not yours. Therefore, he shows mercy and gives. How he gives, you may hear him saying: I teach through all the churches. But the sinner borrows and does not repay (I Cor. VII, 17). See the rich man lending, and not returning: the poor man receiving, and immediately rewarding, so that he may not be in another's debt for long. These are moral teachings. Now behold the mystic poor, that is, the simple and God-fearing one, who hears the word of chastity and keeps it; who hears of mercy and practices it; who hears of meekness and does not become angry. But that rich one, arrogant and proud, hears indeed, but rejects the words of God; who hears of the condemnation of lust and indulges in it even more. In the end, the Church fulfills what it has received, but the Synagogue does not fulfill it. Know the Church to be freed: (Jesus) says, 'They were yours, and you gave them to me, and they have kept your…