As long as Man continues to be the ruthless destroyer of lower living beings, he will never know health or peace. For as long as men massacre animals, they will kill each other. Indeed, he who sows the seed of murder and pain cannot reap joy and love.

Attribution to Pythagoras by Ovid, as quoted in The Extended Circle: A Dictionary of Humane Thought (1985) by Jon Wynne-Tyson, p. 260; also in Vegetarian Times, No. 168 (August 1991), p. 4