The unanswerable mysteries... the attitude that all is uncertain... to summarize it - the humility of the intellect.

Start out understanding religion by saying everything is possibly wrong... As soon as you do that, you start sliding down an edge which is hard to recover from.

The only way to deep happiness is to do something you love to the best of your ability

If there is something very slightly wrong in our definition of the theories, then the full mathematical rigor may convert these errors into ridiculous conclusions.

The game I play is a very interesting one. It's imagination, in a tight straightjacket.

We have found it of paramount importance that in order to progress, we must recognize our ignorance and leave room for doubt.

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.