It's fragile what we know. It's gone every time we forget. Then someone has to learn it all over again.

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.

We are here to inscribe ourselves on the universe, and it is not inappropriate to remind ourselves of this when blank slates are given us.

Logic was to cognition as geometry was to landscape

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.

We should conceive of ourselves not as rulers of Earth, but as highly powerful, conscious stewards: The Earth is given to us in trust, and we can screw it up or make it work well and sustainably.