A fire-eater must eat fire even if he has to kindle it himself.

Uncertainty that comes from knowledge (knowing what you don't know) is different from uncertainty coming from ignorance.

Science is a mechanism, a way of trying to improve your knowledge of nature. It's a system for testing your thoughts against the universe, and seeing whether they match.

I have never written a book that didn't teach me far more than it taught my reader.

To insult someone we call him 'bestial. For deliberate cruelty and nature, 'human' might be the greater insult.

Scientists derive satisfaction from figuring out the puzzle. It's about the quest, not the grail.

It's humbling to think that all animals, including human beings, are parasites of the plant world.