You can never be absolutely certain that anything doesn't exist. But you can show that it's unlikely.

Even if there were no actual evidence in favor of the Darwinian theory, we should still be justified in preferring it over all rival theories.

The less you think, the more you believe.

Professor Challenger, Conan Doyle's science hero, was a sort of irascible man constantly bellowing at people, so he was a little bit of a departure from both of those stereotypes.

The truly adult view [...] is that our life is as meaningful, as full and as wonderful as we choose to make it. And we can make it very wonderful indeed.

People who criticize The Selfish Gene like that often haven't read it. The selfish gene accounts for altruism toward kin and individuals who might be in a position to reciprocate your altruism.

I do think imagination is enormously valuable, and that children should be encouraged in their imagination. That's very true.