But continual and successive repentings for sins differ nothing from the case of those who have not believed at all, except only in their consciousness that they do sin. And I know not which of the two is worst, whether the case of a man who sins knowingly, or of one who, after having repented of his sins, transgresses again. For in the process of proof sin appears on each side,—the sin which in its commission is condemned by the worker of the iniquity, and that of the man who, foreseeing what is about to be done, yet puts his hand to it as a wickedness. And he who perchance gratifies himself in anger and pleasure, gratifies himself in he knows what; and he who, repenting of that in which he gratified himself, by rushing again into pleasure, is near neighbour to him who has sinned wilfully at first. For one, who does again that of which he has repented, and condemning what he does, performs it willingly.
Clement of Alexandria
The Stormata, or Miscellanies