The Stromata or Miscellanies V4

These things, then, are to be abstained from, not for their own sakes, but for the sake of the body; and care for the body is exercised for the sake of the Soul, to which it has reference. For on this account it is necessary for the man who lives as a gnostic to know what is suitable. Since the fact that pleasure is not a good thing is admitted from the fact that certain pleasures are evil, by this reason good appears evil, and evil good. And then, if we choose some pleasures and shun others, it is not every pleasure that is a good thing.