Flagged for the podcast queue — BacklogCast will narrate this and produce the clean-text page. (Sample demonstrating the flow.)
Commonplace
Feynman on knowing
The first principle is that you must not fool yourself — and you are the easiest person to fool.
— Richard Feynman, Surely You’re Joking, Mr. Feynman! (commencement address version, Caltech 1974)