Without an observer at a twenty three degree angle to the light being reflected off a cloud of spherical droplets, there is no rainbow. The whole universe is like that. Our spirits stand at a twenty three degree angle to the universe. There is some new thing created at the contact of photon and retina, some space created between rock and mind.

It would take 2,000 Vietnam Memorials to list the [Twentieth] century's war dead.

The distinguishing mark of true adventures, is that it is often no fun at all while they are actually happening.

It was not power that corrupted people, but fools who corrupted power.

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

It was a mistake to speak one's mind at any time, unless it perfectly matched your political purpose; and it never did.

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.