Tertullian

“ Heretics Do Not Adhere Even to Their Own Traditions, But Harbour Dissent Even from Their Own Founders.
But what shall I say concerning the ministry of the word, since they make it their business not to convert the heathen, but to subvert our people? This is rather the glory which they catch at, to compass the fall of those who stand, not the raising of those who are down. Accordingly, since the very work which they purpose to themselves comes not from the building up of their own society, but from the demolition of the truth, they undermine our edifices, that they may erect their own. ”

“ I am greatly in error if they do not amongst themselves swerve even from their own regulations, forasmuch as every man, just as it suits his own temper, modifies the traditions he has received after the same fashion as the man who handed them down did, when he moulded them according to his own will. ”

“ The consequence is, that they more easily accomplish the ruin of standing houses than the erection of fallen ruins. It is only when they have such objects in view that they show themselves humble and bland and respectful. Otherwise they know no respect even for their own leaders. Hence it is [supposed] that schisms seldom happen among heretics, because, even when they exist, they are not obvious. ”