I have come to the conclusion that my subjective account of my motivation is largely mythical on almost all occasions. I don't know why I do things.

So many new ideas are at first strange and horrible though ultimately valuable that a very heavy responsibility rests upon those who would prevent their dissemination.

Reality is the cage of those who lack imagination.

Haldane was engaged in discussion with an eminent theologian. "What inference," asked the latter, "might one draw about the nature of God from a study of his works?" Haldane replied: "An inordinate fondness for beetles."

Christianity is haunted by the theory of a God with a craving for bloody sacrifices.

My practise as a scientist is atheistic. That is to say, when I set up an experiment I assume that no god, angel, or devil is going to interfere with its course; and this assumption has been justified by such success as I have achieved in my professional career. I should therefore be intellectually dishonest if I were not also atheistic in the affairs of the world. And I should be a coward if I did not state my theoretical views in public.

Would I lay down my life to save my brother? No, but I would to save two brothers or eight cousins.