The Screwtape Letters by C.S. Lewis

I am aware that Screwtape says that the devil is NOT a little man sitting on your shoulder whispering in your ear, but eh. Lewis definitely hit a few sensitive areas with this one, especially when he wrote, "The man who truly and disinterestedly enjoys any one thing in the world, for its own sake, and without caring two-pence what other people say about it, is by that very fact forearmed against some of our subtlest modes of attack. You should always try to make the patient abandon the people or food or books he really likes in favour of the 'best' people, the 'right' food, the 'important' books."