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. I know we have won many a soul through pleasure. All the same, it is His invention, not ours. He made the pleasures: all our research so far has not enabled us to produce one. All we can do is to encourage to humans to take the pleasures which our Enemy has produced, at times, or in ways, or in degrees which He has forbidden. Hence we always try to work away from the natural condition of any pleasure to that in which it is least natural, least redolent of its Maker, and least pleasurable. An ever-increasing craving for an ever diminishing pleasure is the formula.
- The Screwtape Letters, CS Lewis