Our greatest responsibility is to be good ancestors.

It is said to await certainty is to await eternity.

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.

Life is an error-making and an error-correctin g process, and nature in marking man's papers will grade him for wisdom as measured both by survival and by the quality of life of those who survive.

There is a moment of conception and a moment of birth, but between them there is a long period of gestation.

My job is to help people see what I see. If it's of value, fine. And, if it's not of value, then at least I've done what I can do.