24 But to the others what? “But You, O God, shall bring them down unto the pit of corruption”. The pit of corruption is the darkness of sinking under. When blind leads blind, they both fall into a ditch. God brings them down into the pit of corruption, not because He is the author of their own guilt, but because He is Himself the judge of their iniquities. “For God has delivered them unto the desires of their heart.” For they have loved darkness, and not light; they have loved blindness, and not seeing. For behold the Lord Jesus has shone out to the whole world, let them sing in unity with the whole world: “For there is not one that can hide himself from the heat of Him.” But they passing over from the whole to a part, from the body to a wound, from life to a limb cut off, shall meet with what, but going into the pit of corruption?
25. “Men of bloods and of deceitfulness.” Men of bloods, because of slayings he calls them: and O that they were corporal and not spiritual slayings. For blood from the flesh going forth, is seen and shuddered at: who sees the blood of the heart in a man rebaptized? Those deaths require other eyes. Although even about these visible deaths Circumcelliones armed everywhere remain not quiet. And if we think of these visible deaths, there are men of bloods. Give heed to the armed man, whether he is a man of peace and not of blood. If at least a club only he were to carry, well; but he carries a sling, carries an axe, carries stones, carries lances; and carrying these weapons, wherever they may they scour, for the blood of innocent men they thirst. Therefore even with regard to these visible deaths there are men of bloods. But even of them let us say, O that such deaths alone they perpetrated, and souls they slew not. These that are men of bloods and of deceit, let them not suppose that we thus wrongly understand men of bloods, of them that kill souls: they themselves of their Maximianists have so understood it. For when they condemned them, in the very sentence of their Council they have set down these words: “Swift are the feet of them to shed the blood” (of the proclaimers), “tribulation and calamity are in the ways of them, and the way of peace they have not known.” This of the Maximianists they have said. But I ask of them, when have the Maximianists shed the body's blood; not because they too would not shed, if there were so great a multitude as could shed, but because of the fear in their minority rather they have suffered somewhat from others, than have themselves at any time done any such thing. Therefore I question the Donatist and say: In your Council you have set down of the Maximianists, “Swift are the feet of them to shed blood.” Show me one of whom the Maximianists have hurt so much as a finger! What other thing to me is he to answer, than that which I say? They that have separated themselves from unity, and who slay souls by leading astray, spiritually, not carnally, do shed blood. Very well you have expounded, but in your exposition acknowledge their own deeds. “Men of bloods and of deceitfulness.” In guile is deceitfulness, in dissimulation, in seduction. What therefore of those very men that have been divided because of the anger of His countenance? They are themselves men of bloods and of deceit.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)