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.

The wise man regulates his conduct by the theories both of religion and science. But he regards these theories not as statements of ultimate fact but as art-forms.

Reality is the cage of those who lack imagination.

A time will however come (as I believe) when physiology will invade and destroy mathematical physics, as the latter has destroyed geometry.

The world shall perish not for lack of wonders, but for lack of wonder

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

An ounce of algebra is worth a ton of verbal argument.