46 “Let the sinners be consumed out of the earth”. He seems angry! O holy soul, which here does sing and groan! Would that our soul were with that very soul! Would that it were coupled with it, associated, conjoined with it! It shall behold also His loving-kindness when he is angry. For who but he who is filled with charity, understands this? Thou tremblest, because he curses. And who does curse? A saint. Without doubt he is listened to. But it is said unto the saints, “Bless, and curse not.” What is then the sense of the words, “Let the sinners be consumed out of the earth”?
Let them utterly be consumed; let their spirit be taken away, that He may send forth His own Spirit, and they may be restored. “And the ungodly, so that they be no more.” In what that they be no more, save as wicked men? Let them therefore be justified, that they may no longer be ungodly. The Psalmist saw this, and was filled with joy, and repeats the first verse of the Psalm: “Bless thou the Lord, O my soul.” Let our soul bless the Lord, brethren, since He has deigned to give unto us both understanding and the power of language, and unto you attention and earnestness in hearing.
Let each, as he can recall to mind what he has heard, by mutual conversation stir up the food you have received, ruminate on what you have heard, let it not descend in you into the bowels of forgetfulness. Let the treasure to be desired rest upon your lips. These matters have been sought out and discovered with great labour, with great labour have they been announced and discoursed of; may our toil be fruitful unto you, and may our soul bless the Lord.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)