Richard Feynman

"I don't like honors or titles or special positions. I just like physics."

"Pay attention to what you are interested in – that's real motivation."

"Do not keep on the beaten track, it only leads where others have been."

"The test of all knowledge is experiment. Experiment is the sole judge of scientific truth."

"I think it is much more interesting to live not knowing than to have answers which might be wrong."

"Freedom in research is important, and I hope we maintain it."

"If you want to master something, teach it."

"Nature doesn't care what's in your head – only what you can demonstrate."

"The same equations have the same solutions."

"I love my wife. My wife is dead."

"Study hard what interests you most in the most undisciplined, irreverent, and original manner possible."

"Imagine how much harder physics would be if electrons had feelings!"

"Don't worry about what people think about you; it doesn't matter."

"The principle of science is that you don't know anything."

"What matters is the depth of your consciousness of what you do in life."

"I have this one chance to exist for a while in this universe, and so I try to have as good a time as possible."

"You have to start somewhere, and the sooner you start something, the sooner you'll know something."

"The scientist only imposes one constraint: that the explanation must agree with experiment."

"We are all sand and stardust – what matters is how we arrange it."

"Hell, I don't know anything, but I'm curious about it."

"Do not follow rules blindly – understand them first."

"The world is a funny place when you really look at it."

"It is impossible to be curious and afraid at the same time."

"I am always saddened by the fact that the world is not what I think."

"Genius is not about being smart – it's about asking better questions."

"In order to improve, you have to fail; failure is how you learn."

"Every time you explain something to someone else, you learn something yourself."

"The great thing about science is that it works."

"You can't make discoveries without considering what you already know might be wrong."

"Time is the fire in which we burn."