12 “That You may give him patience in days of malice: until the pit be dug up for the ungodly”. Have patience therefore every one, if you are a Christian, in time of malice. Days of malice are those in which the ungodly appear to flourish, and the righteous to suffer; but the suffering of the righteous is the rod of the Father, and the prosperity of the ungodly is their own snare. For because God gives you patience in time of adversity, until the pit be dug up for the ungodly, do not think that the Angels are standing in some place with mattocks, and are digging that great pit which shall be able to contain the whole race of the ungodly; and because ye see that the wicked are many, and say unto yourselves carnally: Truly what pit can contain so great a multitude of the wicked, such a crowd of sinners? Where is a pit of such dimensions, as to contain all, dug? When finished? Therefore God spares them. This is not so: their very prosperity is the pit of the wicked: for into that shall they fall, as it were into a pitfall. Attend, brethren, for it is a great thing to know that prosperity is called a pitfall: “until the pit be dug up for the ungodly.” For God spares him whom He knows to be ungodly and impious, in His own hidden justice: and this very sparing of God, causes him to be puffed up through his impunity....The proud man raises himself up against God: God sinks him: and he sinks by the very act of raising himself up against God. For in another Psalm he thus says, “You have cast them down, while they were being exalted.” He said not, You have cast them down, because they were exalted; or, You have cast them down, after they were exalted; so that the period of their exaltation be one, of their casting down another: but in the very act of their exaltation were they cast down. For in proportion as the heart of man is proud, so does it recede from God; and if it recede from God, it sinks down into the deep. On the other hand, the humble heart brings God unto it from heaven, so that He becomes very near unto it. Surely God is lofty, God is above all the heavens, He surpasses all the Angels: how high must these be raised, to reach that exalted One? Do not burst yourself by enlarging yourself; I give you other advice, lest perchance in enlarging yourself you burst, through pride: surely God is lofty: do thou humble yourself, and He will descend unto you.
13....Do thou rejoice beneath the scourge: because the heritage is kept for you, “for the Lord will not cast off His people”. He chastens for a season, He condemns not for ever: the others He spares for a season, and will condemn them for evermore. Make your choice: do you wish temporary suffering, or eternal punishment? Temporal happiness, or eternal life? What does God threaten? Eternal punishment. What does He promise? Eternal rest. His scourging the good, is temporary: His sparing the wicked, is also temporary. “Neither will He forsake His inheritance.”
14. “Until righteousness,” he says, “turn again unto judgment, and all they that have it are right in heart”. Listen now, and gain righteousness: for judgment you can not yet have. You should gain righteousness first; but that very righteousness of yours shall turn unto judgment. The Apostles had righteousness here on earth, and bore with the wicked. But what is said unto them? “You shall sit on twelve thrones, judging the twelve tribes of Israel.” Their righteousness therefore shall turn unto judgment. For whoever is righteous in this life, is so for this reason, that he may endure evils with patience: let him suffer patiently the period of suffering, and the day of judging comes. But why do I speak of the servants of God? The Lord Himself, who is the Judge of all living and dead, first chose to be judged, and then to judge. Those who have righteousness at present, are not yet judges. For the first thing is to have righteousness, and afterwards to judge: He first endures the wicked, and afterwards judges them. Let there be righteousness now: afterwards it shall turn again unto judgment. And so long He endures wicked men, as God does will, as long as God's Church shall endure them, that she may be taught through their wickedness. Nevertheless, God will not cast off His people, “all such as have it are right in heart.” Who are those who are right in heart? Those whose will is the will of God. He spares sinners: thou dost wish Him at once to destroy sinners. Your heart is crooked and your will perverted, when your will is one way and the will of God another. God wishes to spare sinners: thou dost not wish sinners spared. God is of long-suffering to sinners: thou dost not wish to endure sinners....Wish not to bend the will of God to your will, but rather correct your will to His. The will of God is like a rule: behold, suppose, you have twisted the rule: whence can you be set straight? But the rule itself continues straight: for it is immutable. As long as the rule is straight, you have whither to turn yourself, and straighten your perversity; you have a means of correcting what is crooked in you. But what do men will? It is not enough that their own will is crooked; they even wish to make the will of God crooked according to their own heart, that God may do what they themselves will, when they ought to do that which God wills....
15. “Who will rise up for me against the wicked? Or who will take my part against the evil doers?”. Many persuade us to various evils: the serpent ceases not to whisper to you to work iniquity: whichever way you shall turn, if perchance you have done well, you seek to live well with some one, and thou hardly findest any one; many wicked men surround you, for there are few grains of wheat, and much chaff. This floor has its grains of grain, but as yet they suffer. Therefore the whole mass of the wheat, when separated from the chaff, will be great: the grains are few, but when compared with the chaff, still many in themselves. When therefore the wicked cry out on every side, and say, Why do you live thus? Are you the only Christian? Why do you not do what others also do? Why do you not frequent the theatres, as others do? Why do you not use charms and amulets? Why do you not consult astrologers and soothsayers, even as others do? And thou crossest yourself, and sayest, I am Christian, that you may repel them, whosoever they are; but the enemy presses on, urges his attacks; what is worse, by the example of Christians he chokes Christians. They toil on, in the midst of heat: the Christian soul suffers tribulation: yet it has power to conquer: has it such power of itself? For this reason remark what he says. For he answers, What does it profit me that I now find charms for myself, and gain a few days? I depart hence from this life, and repair unto my Lord, who shall send me into the flames; because I have preferred a few days to life eternal, He shall send me into hell. What hell? That of the eternal judgment of God. Is it really so (the enemy answers), unless indeed thou really believest that God cares how men live? And perhaps it is not an acquaintance who speaks thus to you in the street, but your wife at home, or possibly the husband to the faithful and holy wife, her deceiver. If it be the woman to her husband, she is as Eve unto him; if as the husband unto the wife, he is as the devil unto her: either she is herself as Eve unto you, or you are a serpent unto her. Sometimes the father would incline his thoughts to his son, and finds him wicked, utterly depraved: he is in a fever of misery, he wavers, he seeks how to subdue him, he is almost drawn in, and consents: but may God be near him....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)