We all remember how many religious wars were fought for a religion of love and gentleness; how many bodies were burned alive with the genuinely kind intention of saving souls from the eternal fire of hell.

No book can ever be finished. While working on it we learn just enough to find it immature the moment we turn away from it

I remained a socialist for several years, even after my rejection of Marxism; and if there could be such a thing as socialism combined with individual liberty, I would be a socialist still. For nothing could be better than living a modest, simple, and free life in an egalitarian society.

Definitions.... are never really needed, and rarely of any use

Every discovery contains an irrational element or a creative intuition.

I have come to the conclusion that Darwinism is not a testable scientific theory, but a metaphysical research programme.

The moral decisions of others should be treated with respect, as long as such decisions do not conflict with the principle of tolerance.