Sanity and enlightenment...I've been reading a new book Dogen's Genjo Koan: Three Commentaries, and it contains a commentary on Genjo Koan by Shunryu Suzuki, the author who wrote Zen Mind, Beginners Mind. He doesn't mention sanity at all but I think that one possible definition of enlightenment would be a kind of profound sanity, where being insane is no longer an option.