Tertullian

“ For it either happens that, while men wonder, they fall into a snare, or, because they are ensnared, they cherish their surprise, as if heresies were so powerful because of some truth which belonged to them. It would no doubt be a wonderful thing that evil should have any force of its own, were it not that heresies are strong in those persons who are not strong in faith. In a combat of boxers and gladiators, generally speaking, it is not because a man is strong that he gains the victory, or loses it because he is not strong, but because he who is vanquished was a man of no strength ”

“ In like manner, with respect to heresies, which are produced for the weakening and the extinction of faith, since we feel a dread because they have this power, we should first dread the fact of their existence; for as long as they exist, they have their power; and as long as they have their power, they have their existence. ”