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.

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.

I will give up my belief in evolution if someone finds a fossil rabbit in the Precambrian.

I will jump into the river to save two brothers or eight cousins.

And if we must educate our poets and artists in science, we must educate our masters, labour and capital, in art.

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

Man armed with science is like a baby with a box of matches.