[John] von Neumann gave me an interesting idea: that you don't have to be responsible for the world that you're in. So I have developed a very powerful sense of social irresponsibility as a result of von Neumann's advice. It's made me a very happy man ever since. But it was von Neumann who put the seed in that grew into my active irresponsibility!

Part 3: "Feynman, The Bomb, and the Military", "Los Alamos from Below", p. 132 - Surely You're Joking, Mr. Feynman! (1985)