2 Observe ye two kinds of men; the one of men labouring, the other of those among whom they labour: the one of men thinking of earth, the other of heaven: the one of men weighing down their heart unto the deep, the other of men with Angels their heart conjoining: the one trusting in earthly things, wherein this world abounds, the other confiding in heavenly things, which God, who lies not, has promised. But mingled are these kinds of men. We see now the citizen of Jerusalem, citizen of the kingdom of heaven, have some office upon earth: to wit, one wears purple, is a Magistrate, is Ædile, is Proconsul, is Emperor, does direct the earthly republic: but he has his heart above, if he is a Christian, if he is a believer, if he is godly, if he is despising those things wherein he is, and trusts in that wherein he is not yet. Of which kind was that holy woman Esther, who, though she was wife of a king, incurred the danger of interceding for her countrymen: and when she was praying before God, where she could not lie, in her prayer said, that her royal ornaments were to her but as the cloth of a menstruous woman. Despair we not then of the citizens of the kingdom of heaven, when we see them engaged in any of Babylon's matters, doing something earthly in republic earthly: nor again let us immediately congratulate all men that we see doing matters heavenly; because even the sons of pestilence sit sometimes in the seat of Moses, of whom is said, “What things they say, do ye: but what things they do, do not: for they say, and do not.” Those, amid earthly things, lift up heart unto heaven, these, amid heavenly words, trail heart upon earth. But there will come time of winnowing, when both are to be severed with greatest diligence, in order that no grain may pass over unto the heap of chaff that is to be burned, that not one single straw may pass over to the mass that is to be stored in the barn. So long as then now it is mingled, hear we thence our voice, that is, voice of the citizens of the kingdom of heaven (for to this we ought to aspire, to bear with evil men here, rather than be borne with by good men): and let us conjoin ourselves to this voice, both with ear and with tongue, and with heart and work. Which if we shall have done, we are here speaking in those things which we hear. Let us therefore speak first of the evil body of kingdom earthly.
3. “Why does he glory in malice that is mighty?”. Observe, my brethren, the glorying of malignity, the glorying of evil men. Where is glorying? “Why does he glory in malice that is mighty?” That is, he that in malice is mighty, why does he glory? There is need that a man be mighty, but in goodness, not in malice. Is it any great thing to glory in malice? To build a house does belong to few men, any ignorant man you please can pull down. To sow wheat, to dress the crop, to wait until it ripen, and in that fruit on which one has laboured to rejoice, does belong to few men: with one spark any man you please can burn all the crop. To breed an infant, when born to feed him, to educate, to bring him on to youth's estate, is a great task: to kill him in one moment of time any one you please is able. Therefore those things which are done for destruction, are most easily done. “He that glories, let him glory in the Lord:” he that glories, let him glory in goodness. Thou gloriest, because you are mighty in evil. What are you about to do, O mighty man, what are you about to do, boasting yourself much? You are about to kill a man: this thing also a scorpion, this also one fever, this also a poisonous fungus can do. To this is your mightiness reduced, that it be made equal to a poisonous fungus? This therefore do the good citizens of Jerusalem, who not in malice but in goodness glory: firstly, that not in themselves, but in the Lord they glory. Secondly, that those things which make for edification they earnestly do, and do such things as are strong to abide: but things which make for destruction they may do, for the discipline of men advancing, not for the oppression of the innocent. To this mightiness then that earthly body being compared, why may it not hear out of these words, “Why does he glory in malice that is mighty?”
4. “In iniquity the whole day upon injustice has your tongue thought”: that is, in the whole of time, without weariness, without intermission, without cessation. And when you do not, you think, so that when anything of evil is away from your hands, from your heart it is not away; either you do an evil thing, or while you can not do, you say an evil thing, that is, thou evil-speakest: or when not even this you can do, you will and thinkest an evil thing. “The whole day,” then, that is, without intermission. We expect punishment to this man. Is he to himself a small punishment? Thou threatenest him: thou, when you threaten him, wilt send him whither? Unto evil? Send him away unto himself. In order that you may vent much rage, you are going to give him into the power of beasts: unto himself he is worse than beasts. For a beast can mangle his body: of himself he cannot leave his heart whole. Within, against himself he does rage of himself, and do you from without seek for stripes? Nay, pray God for him, that he may be set free from himself. Nevertheless in this Psalm, my brethren, there is not a prayer for evil men, or against evil men, but a prophecy of what is to result to evil men. Think not therefore that the Psalm of ill-will says anything: for it is said in the spirit of prophecy.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)