The most important question we must ask ourselves is, 'Are we being good ancestors?'

As a child I was not interested in science. I was merely interested in things human, the human side of nature, if you like, and I continue to be interested in that. That's what motivates me.

It is courage based on confidence, not daring, and it is confidence based on experience.

I have come to recognize evolution not only as an active process that I am experiencing at the time, but as something I can guide by the choices I make.

I feel that the greatest reward for doing is the opportunity to do more.

Wisdom: It's something that you know when you see it. You can recognize it, you can experience it. I have defined wisdom as the capacity to make judgments that when looked back upon will seem to have been wise.

It is said to await certainty is to await eternity.