Thinking about language, while thinking _in_ language, leads to puzzles and paradoxes.

Intuition was not just visual but also auditory and kinesthetic. Those who watched Feynman in moments of intense concentration came away with a strong, even disturbing sense of the physicality of the process, as though his brain did not stop with the grey matter but extended through every muscle in his body.

It is not the amount of knowledge that makes a brain. It is not even the distribution of knowledge. It is the interconnectedness.

For [Richard] Feynman, the essence of the scientific imagination was a powerful and almost painful rule. What scientists create must match reality. It must match what is already known. Scientific creativity is imagination in a straitjacket.

The universe is computing its own destiny.

I can't remember the last book that taught me so much, and so well, about what it means to be human.

Information is not knowledge and knowledge is not wisdom.