Ordinarily it would take me about fifteen minutes to get a hallucination going," wrote Feynman, "but on a few occasions, when I smoked some marijuana beforehand, it came very quickly.

What is not surrounded by uncertainty cannot be the truth.

There is no learning without having to pose a question. And a question requires doubt.

Everything is made of atoms.

The same equations have the same solutions

Know how to solve every problem that has been solved.

Don't think about what you want to be, but what you want to do. Keep up some kind of a minimum with other things so that society doesn't stop you from doing anything at all.