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“All the time you're saying to yourself, 'I could do that, but I won't,' — which is just another way of saying that you can't.”
― Richard P. Feynman, Surely You're Joking, Mr. Feynman!: Adventures of a Curious Character

“The first principle is that you must not fool yourself and you are the easiest person to fool.”
― Richard P. Feynman

“You have no responsibility to live up to what other people think you ought to accomplish. I have no responsibility to be like they expect me to be. It's their mistake, not my failing.”
― Richard P. Feynman, Surely You're Joking, Mr. Feynman!: Adventures of a Curious Character

“Physics is like sex: sure, it may give some practical results, but that's not why we do it.”
― Richard P. Feynman