Church history is littered with examples of sects and factions who taught various versions of Christian perfectionism - John MacArthur

Church history is littered with examples of sects and factions who taught various versions of Christian perfectionism. Nearly all these groups have either made utter shipwreck of the faith or been forced to modify their perfectionism to accommodate human imperfection. Every perfectionist inevitably comes face-to-face with clear and abundant empirical evidence that the residue of sin remains in the flesh and troubles even the most spiritual Christians throughout their earthly lives. In order to hang onto perfectionist doctrine, they must redefine sin or diminish the standard of holiness. Too often they do this at the expense of their own consciences. 

- John MacArthur 

The Vanishing Conscience, 127