" Never forget that when we are dealing with any pleasure in its healthy and normal and satisfying form, we are, in a sense, on the Enemy's ground...All the same, it is His invention, not ours...All we can do is to encourage the humans to take the pleasures which our Enemy has produced, at times, or in ways, or in degrees, which He has forbidden...An ever increasing craving for an ever diminishing pleasure is the formula. "

― C.S. Lewis , The Screwtape Letters