10 “I have eaten ashes as it were bread: and mingled my drink with weeping”. Because He chose to have among His members these kinds of men, that they should be healed and set free, thence is the evil repute. Now at this day what is the character of Pagan calumny against us? What, brethren, do ye conceive they tell us? You corrupt discipline, and pervert the morality of the human race. Why do you attack us; say why? What have we done? By giving, he replies, to men room for repentance, by promising impunity for all sins: for this reason men do evil deeds, careless of consequences, because everything is pardoned them, when they are converted....And what is to become of you, miserable man, if there shall be no harbour of impunity?
If there is only licence for sinning, and no pardon for sins, where will you be, whither will you go? Surely even for you did it happen, that that afflicted one ate ashes as it were bread, and mingled His drink with weeping. Does not such a feast now please you? But nevertheless, he replies, men add to their sins under the hope of pardon. Nay, but they would add to them if they despaired of pardon. Do you not observe in what licentious cruelty gladiators live? Whence this, except because, as destined for the sword and sacrifice, they choose to sate their lust, before they pour forth their blood? Would you not also thus address yourself?
I am already a sinner, already an unjust man, one already doomed to damnation, hope of pardon there is none: why should I not do whatever pleases me, although it be not lawful? Why not fulfil, as far as I can, any longings I may have, if, after these, nothing but torments only be in store? Would you not thus speak unto yourself, and from this very despair become still worse? Rather than this, then, He who promises forgiveness, does correct you, saying, “As I live, says the Lord, I have no pleasure in the death of the wicked; but that the wicked turn from his way and live.”...For in order that men might not live the worse from despair, He promised a harbour of forgiveness; again, that they might not live the worse from hope of pardon, He made the day of death uncertain: fixing both with the utmost providence, both as a refuge for the returning, and a terror to the loitering.
Eat ashes as bread, and mingle your drink with weeping; by means of this banquet you shall reach the table of God. Despair not; pardon has been promised you. Thanks be to God, he says, because it is promised; I hold fast the promise of God. Now therefore live well. Tomorrow, he replies, I will live well. God has promised the pardon; no one promised you tomorrow....
Source: The Enarrations, or Expositions, on the Psalms (New Advent)