Time is a great teacher, but unfortunately it kills all its pupils.

From Hector Berlioz in a letter written in November 1856, published in Pierre Citron (ed.) Correspondance générale (Paris: Flammarion, 1989) vol. 5, p. 390; Paul Davies About Time: Einstein’s Unfinished Revolution (New York: Simon & Schuster, 1996) p. 214.

Le temps est un grand maître, dit-on; le malheur est qu'il soit un maître inhumain qui tue ses élèves.

Time is a great teacher, but unfortunately it kills all its pupils.