Feynman, Richard-Surely You're Joking, Mr. Feynman
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p173
"Physics disgusts me a little bit now, but I used to enjoy doing physics. Why did I enjoy it? I used to play with it. I used to do whatever I felt like doing-- it didn't have to do with whether it was important for the development of nuclear physics, but whether it was interesting and amusing for me to play with.... That didn't make any difference: I'd invent things and play with things for my own entertainment... I'm going to play with physics, whenever I want to, without worrying about any importance whatsoever."
p174
"It was effortless. It was easy to play with these things. It was like uncorking a bottle: Everything flowed out effortlessly. I almost tried to resist it! There was no importance to what I was doing, but ultimately there was. The diagrams and the whole business that I got the Nobel Prize for came from that piddling around with the wobbling plate."