5 What is that which looking forth we acknowledge? What is that which looking forth God acknowledges? What (because here He gives it) does He acknowledge? Hear what it is; that “All have gone aside, together useless they have become: there is not one that does good, there is not so much as one.” What then is that other question, but the same whereof a little before I have made mention? If, “There is not one that does good, is not so much as one,” no one remains to groan amid evil men. Stay, says the Lord, do not hastily give judgment. I have given to men to do well; but of Me, He says, not of themselves: for of themselves evil they are: sons of men they are, when they do evil; when well, My sons. For this thing God does, out of sons of men He makes sons of God: because out of Son of God He has made Son of Man. See what this participation is: there has been promised to us a participation of Divinity: He lies that has promised, if He is not first made partaker of mortality. For the Son of God has been made partaker of mortality, in order that mortal man may be made partaker of divinity. He that has promised that His good is to be shared with you, first with you has shared your evil: He that to you has promised divinity, shows in you love. Therefore take away that men are sons of God, there remains that they are sons of men: “There is none that does good, is not so much as one.”
6. “Shall not all know that work iniquity, that devour My people for the food of bread”?....There is therefore here a people of God that is being devoured. Nay, “There is not one that does good, there is not so much as one.” We reply by the rule above. But this people that is devoured, this people that suffers evil men, this that groans and travails amid evil men, now out of sons of men have been made sons of God: therefore are they devoured. For, “The counsel of the needy man you have confounded, because the Lord is his hope.” For ofttimes, in order that the people of God may be devoured, this very thing in it is despised, that it is the people of God. I will pillage, he says, and despoil; if he is a Christian, what will he do to me?...But what follows? “I will convince you, and will set you before your face.” You will not now know so as you should be displeasing to yourself, you shall know so as you may mourn. For God cannot but show to the unrighteous their iniquity. If He is not to show, who will they be that are to say, “What has profited us pride, and what has boasting of riches bestowed upon us?” For then shall they know, that now will not know. “Shall not all know?” etc. Why has He added, “for the food of bread”? As it were as bread, they eat My people. For all other things which we eat, we can eat now these, now those; not always this vegetable, not always this flesh, not always these apples: but always bread. What is then, “Devour My people for the food of bread”? Without intermission, without cessation they devour.
7. “On God they have not called.” He is comforting the man that groans, and chiefly by an admonition, lest by imitating evil men, who ofttimes prosper, they delight in evil doing. There is kept for you that which to you has been promised: their hope is present, yours is future, but theirs is transient, yours sure; theirs false, yours true. For they “upon God have not called.” Do not daily such men ask of God? They do “not” ask of God. Give heed, if I am able to say this by the aid of God Himself. God gratuitously will have Himself to be worshipped, gratuitously will have Himself to be loved, that is chastely to be loved; not Himself to be loved for the reason that He gives anything besides Himself, but because He gives Himself. He then that calls upon God in order that He may be made rich, on God does not call: for upon that He calls which to himself he wills to come....But now you would have coffer full, and conscience void: God fills not coffer, but breast. What do outward riches profit you, if inward need presses you? Therefore those men that for the sake of worldly comforts, that for the sake of earthly good things, that for the sake of present life and earthly felicity, call upon God, do not call upon God.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)