Life is insanely robust, though we can make species go extinct, and this is the bad thing. So I always make the point that you can't say, 'Is it too late?' That is the terrible question, because either answer promotes inaction. If it's too late, you don't need to act; if it's not too late, you don't need to act.

The only part of an argument that really matters is what we think of the people arguing.

Logic was to cognition as geometry was to landscape

The invisible hand never picks up the check.

Very few people ever bother to find out what other people really think. They are willing to accept whatever they are told about anyone sufficiently distant.

A lot of scientists act on their beliefs and so do things that look crazy to the rest of us.

Below the 40th latitude there is no law; below the 50th no god; below the 60th no common sense and below the 70th no intelligence whatsoever.