28 Moreover, how much are they both greater in faith and better in their fear, who, although bound by no crime of sacrifice to idols or of certificate, yet, since they have even thought of such things, with grief and simplicity confess this very thing to God's priests, and make the conscientious avowal, put off from them the load of their minds, and seek out the salutary medicine even for slight and moderate wounds, knowing that it is written, “God is not mocked.” God cannot be mocked, nor deceived, nor deluded by any deceptive cunning.
Yea, he sins the more, who, thinking that God is like man, believes that he evades the penalty of his crime if he has not openly admitted his crime. Christ says in His precepts, “Whosoever shall be ashamed of me, of him shall the Son of man be ashamed.” And does he think that he is a Christian, who is either ashamed or afraid to be a Christian? How can he be one with Christ, who either blushes or fears to belong to Christ? He will certainly have sinned less, by not seeing the idols, and not profaning the sanctity of the faith under the eyes of a people standing round and insulting, and not polluting his hands by the deadly sacrifices, nor defiling his lips with the wicked food.
This is advantageous to this extent, that the fault is less, not that the conscience is guiltless. He can more easily attain to pardon of his crime, yet he is not free from crime; and let him not cease to carry out his repentance, and to entreat the Lord's mercy, lest what seems to be less in the quality of his fault, should be increased by his neglect of atonement.
Source: The Treatises of Cyprian (New Advent)