
“The first principle is that you must not fool yourself — and you are the easiest person to fool.”
" Cargo Cult Science http://calteches.library.caltech.edu/51/2/CargoCult.htm", adapted from a 1974 Caltech commencement address; also published in Surely You're Joking, Mr. Feynman!, p. 343
Variant: The first principle is that you must not fool yourself — and you are the easiest person to fool.