8 But whether the former exposition of this place, or this last be the more suitable, without prejudice to any one better, or equal, or as good, it follows very consistently, “the Lord judges the people.” For whether He returned on high, when, after the resurrection, He ascended into heaven, well does it follow, “The Lord judges the people:” for that He will come from thence to judge the quick and the dead. Or whether He return on high, when the understanding of the truth leaves sinful Christians, for that of His coming it has been said, “Do you think the Son of Man on His coming will find faith on the earth?” “The Lord” then “judges the people.” What Lord, but Jesus Christ? “For the Father judges no man, but has committed all judgment unto the Son.” Wherefore this soul which prays perfectly, see how she fears not the day of judgment, and with a truly secure longing says in her prayer, “Your kingdom come: judge me,” she says, “O Lord, according to my righteousness.” In the former Psalm a weak one was entreating, imploring rather the mercy of God, than mentioning any desert of his own: since the Son of God came “to call sinners to repentance.” Therefore he had there said, “Save me, O Lord, for Your mercy's sake;” that is, not for my desert's sake. But now, since being called he has held and kept the commandments which he received, he is bold to say, “Judge me, O Lord, according to my righteousness, and according to my harmlessness, that is upon me.” This is true harmlessness, which harms not even an enemy. Accordingly, well does he require to be judged according to his harmlessness, who could say with truth, “If I have repaid them that recompense me evil.” As for what he added, “that is upon me,” it can refer not only to harmlessness, but can be understood also with reference to righteousness; that the sense should be this, Judge me, O Lord, according to my righteousness, and according to my harmlessness, which righteousness and harmlessness is upon me. By which addition he shows that this very thing, that the soul is righteous and harmless, she has not by herself, but by God who gives brightness and light. For of this he says in another Psalm, “You, O Lord, wilt light my candle.” And of John it is said, that “he was not the light, but bore witness of the light.” “He was a burning and shining candle.” That light then, whence souls, as candles, are kindled, shines forth not with borrowed, but with original, brightness, which light is truth itself. It is then so said, “According to my righteousness, and according to my harmlessness, that is upon me,” as if a burning and shining candle should say, Judge me according to the flame which is upon me, that is, not that wherewith I am myself, but that whereby I shine enkindled of you.
9. “But let the wickedness of sinners be consummated”. He says, “be consummated,” be completed, according to that in the Apocalypse, “Let the righteous become more righteous, and let the filthy be filthy still.” For the wickedness of those men appears consummate, who crucified the Son of God; but greater is theirs who will not live uprightly, and hate the precepts of truth, for whom the Son of God was crucified. “Let the wickedness of sinners,” then he says, “be consummated,” that is, arrive at the height of wickedness, that just judgment may be able to come at once. But since it is not only said, “Let the filthy be filthy still;” but it is said also, “Let the righteous become more righteous;” he joins on the words, “And You shall direct the righteous, O God, who searches the hearts and reins.” How then can the righteous be directed but in secret? When even by means of those things which, in the commencement of the Christian ages, when as yet the saints were oppressed by the persecution of the men of this world, appeared marvellous to men, now that the Christian name has begun to be in such high dignity, hypocrisy, that is pretence, has increased; of those, I mean, who by the Christian profession had rather please men than God. How then is the righteous man directed in so great confusion of pretence, save while God searches the hearts and reins; seeing all men's thoughts, which are meant by the word heart; and their delights, which are understood by the word reins? For the delight in things temporal and earthly is rightly ascribed to the reins; for that it is both the lower part of man, and that region where the pleasure of carnal generation dwells, through which man's nature is transferred into this life of care, and deceiving joy, by the succession of the race. God then, searching our heart, and perceiving that it is there where our treasure is, that is, in heaven; searching also the reins, and perceiving that we do not assent to flesh and blood, but delight ourselves in the Lord, directs the righteous man in his inward conscience before Him, where no man sees, but He alone who perceives what each man thinks, and what delights each. For delight is the end of care; because to this end does each man strive by care and thought, that he may attain to his delight. He therefore sees our cares, who searches the heart. He sees too the ends of cares, that is delights, who narrowly searches the reins; that when He shall find that our cares incline neither to the lust of the flesh, nor to the lust of the eyes, nor to the pride of life, all which pass away as a shadow, but that they are raised upward to the joys of things eternal, which are spoilt by no change, He may direct the righteous, even He, the God who searches the hearts and reins. For our works, which we do in deeds and words, may be known unto men; but with what mind they are done, and to what end we would attain by means of them, He alone knows, the God who searches the hearts and reins.
10. “My righteous help is from the Lord, who makes whole the upright in heart”. The offices of medicine are twofold, on the curing infirmity, the other the preserving health. According to the first it was said in the preceding Psalm, “Have mercy on me, O Lord, for I am weak;” according to the second it is said in this Psalm, “If there be iniquity in my hands, if I have repaid them that recompense me evil, may I therefore fall by my enemies empty.” For there the weak prays that he may be delivered, here one already whole that he may not change for the worse. According to the one it is there said, “Make me whole for Your mercy's sake;” according to this other it is here said, “Judge me, O Lord, according to my righteousness.” For there he asks for a remedy to escape from disease; but here for protection from falling into disease. According to the former it is said, “Make me whole, O Lord, according to Your mercy:” according to the latter it is said, “My righteous help is from the Lord, who makes whole the upright in heart.” Both the one and the other makes men whole; but the former removes them from sickness into health, the latter preserves them in this health. Therefore there the help is merciful, because the sinner has no desert, who as yet longs to be justified, “believing on Him who justifies the ungodly;” but here the help is righteous, because it is given to one already righteous. Let the sinner then who said, “I am weak,” say in the first place, “Make me whole, O Lord, for Your mercy's sake;” and here let the righteous man, who said, “If I have repaid them that recompense me evil,” say, “My righteous help is from the Lord, who makes whole the upright in heart.” For if he sets forth the medicine, by which we may be healed when weak, how much more that by which we may be kept in health. For if “while we were yet sinners, Christ died for us, how much more being now justified shall we be kept whole from wrath through Him.”
Source: The Enarrations, or Expositions, on the Psalms (New Advent)