12 Nor does it behoove me, dearest brother, to do like things to them, and to go through in my discourse those things which they have committed, and still commit, since we have to consider what it becomes God's priests to utter and to write. Nor ought grief to speak among us so much as shame, and I ought not to seem provoked rather to heap together reproaches than crimes and sins. Therefore I am silent upon the deceits practised in the Church. I pass over the conspiracies and adulteries, and the various kinds of crimes.
That circumstance alone, however, of their wickedness, in which the cause is not mine, nor man's, but God's, I do not think must be withheld; that from the very first day of the persecution, while the recent crimes of the guilty were still hot, and not only the devil's altars, but the very hands and the mouths of the lapsed, were still smoking with the abominable sacrifices, they did not cease to communicate with the lapsed, and to interfere with their repentance. God cries, “He that sacrifices unto any gods, save unto the Lord only, shall be rooted out.” And in the Gospel the Lord says, “Whosoever shall deny me, him will I deny.” And in another place the divine indignation and anger are not silent, saying, “To them have you poured out a drink-offering, and to them have you offered a meat-offering.
Shall I not be angry with these things? Says the Lord.” And they interfere that God may not be entreated, who Himself declares that He is angry; they interpose that Christ may not be besought with prayers and satisfactions, who professes that him who denies Him He will deny.
Source: The Epistles of Cyprian (New Advent)