Richard Feynman Quotes by James Gleick, Leonard Susskind, Leon M. Lederman, Charles Hard Townes and many others.

“Half genius and half buffoon,” Freeman Dyson … wrote. … [Richard] Feynman struck him as uproariously American-unbuttoned and burning with physical energy. It took him a while to realize how obsessively his new friend was tunneling into the very bedrock of modern science.
[Richard Feynman] truly believed that if you couldn’t explain something simply, you didn’t understand it.
Theorists write all the popular books on science: Heinz Pagels, Frank Wilczek, Stephen Hawking, Richard Feynman, et al. And why not? They have all that spare time.
The late Richard Feynman, a superb physicist, said once as we talked about the laser that the way to tell a great idea is that, when people hear it, they say, ‘Gee, I could have thought of that.’