I have never yet met a healthy person who worried very much about his health, or a really good person who worried much about his own soul.

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.

So far from being an isolated phenomenon the late war is only an example of the disruptive result that we may constantly expect from the progress of science.

We do not know, in most cases, how far social failure and success are due to heredity, and how far to environment. But environment is the easier of the two to improve.

In fact, words are well adapted for description and the arousing of emotion, but for many kinds of precise thought other symbols are much better.

If human beings could be propagated by cutting, like apple trees, aristocracy would be biologically sound.

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.