The Internet is like a town that leaves its streets unmarked on the principle that people who don't already know don't belong

Information is not knowledge and knowledge is not wisdom.

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

We say that time passes, time goes by, and time flows. Those are metaphors. We also think of time as a medium in which we exist.

Geniuses of certain kinds - mathematicians, chess players, computer programmers - seem, if not mad, at least lacking in the social skills most easily identified with sanity.

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.

Ideas that require people to reorganize their picture of the world provoke hostility.