Religion is defined as social systems whose participants avow a supernatural agent or agents whose approval is to be sought.

To put it bluntly but fairly, anyone today who doubts that the variety of life on this planet was produced by a process of evolution is simply ignorant — inexcusably ignorant, in a world where three out of four people have learned to read and write.

Words have a genealogy and it's easier to trace the evolution of a single word than the evolution of a language.

The way evolution always discovers reasons is by retroactive endorsement.

If you can approach the world's complexities, both its glories and its horrors, with an attitude of humble curiosity, acknowledging that however deeply you have seen, you have only scratched the surface, you will find worlds within worlds, beauties you could not heretofore imagine, and your own mundane preoccupations will shrink to proper size, not all that important in the greater scheme of things.

For more than a century, people have often thought that the conclusion to draw from Darwin's vision is that Homo sapiens, our species - and we're just animals too, we're just mammals - that there is nothing morally special about us. I myself don't think this follows at all from Darwin's vision, but it is certainly the received view in many quarters.

I think that there are no forces on this planet more dangerous to us all than the fanaticisms of fundamentalism, of all the species: Protestantism, Catholicism, Judaism, Islam, Hinduism, and Buddhism, as well as countless smaller infections. Is there a conflict between science and religion here? There most certainly is.