Teleology is like a mistress to a biologist: he cannot live without her but he's unwilling to be seen with her in public.

It was a reaction from the old idea of "protoplasm", a name which was a mere repository of ignorance.

Capitalism, though it may not always give the scientific worker a living wage, will always protect him, as being one of the geese which produce golden eggs for its table.

I have never yet met a healthy person who worried very much about his health, or a really good person who worried much about his own soul.

To the biologist the problem of socialism appears largely as a problem of size.

Blake expressed some doubt as to whether God had made the tiger. But the tiger is in many ways an admirable animal. We have now to ask whether God made the tapeworm. And it is questionable whether an affirmative answer fits in either with what we know about the process of evolution or what many of us believe about the moral perfection of God.

The extreme socialists desire to run every nation as a single business concern.