I have often quoted in talks Anatole France's terse brilliant phrase, "All is opinion." The Brahmins consider a twice-daily shower bath to be an essential part of their religion. The moderns say that cleanliness is next to godliness. Yet many a medieval monk remained unwashed for long periods, rejecting baths as luxuries for the effete and indulgences for the body.
-- Notebooks Category 5: The Body > Chapter 4: Fasting > # 52