This is my prediction for the future: Whatever hasn't happened will happen, and no one will be safe from it.

Shelley and Keats were the last English poets who were at all up to date in their chemical knowledge.

Until politics are a branch of science, we shall do well to regard political and social reforms as experiments rather than short-cuts to the millennium.

The advance of scientific knowledge does not seem to make either our universe or our inner life in it any less mysterious.

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

I have tried to show why I believe that the biologist is the most romantic figure on earth at the present day. At first sight he seems to be just a poor little scrubby underpaid man, groping blindly amid the mazes of the ultra-microscopic, engaging in bitter and lifelong quarrels over the nephridia of flatworms, waking perhaps one morning to find that someone whose name he has never heard has demolished by a few crucial experiments the work which he had hoped would render him immortal.

We must learn not to take traditional morals too seriously. And it is just because even the least dogmatic of religions tends to associate itself with some kind of unalterable moral tradition, that there can be no truce between science and religion.