The conclusion forced upon me in the course of a life devoted to natural science is that the universe as it is assumed to be in physical science is only an idealized world, while the real universe is the spiritual universe in which spiritual values count for everything.

Money can buy a fine dog but it is kindness that makes him wag his tail.

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.

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.

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

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

To the biologist the problem of socialism appears largely as a problem of size.