An attempt to study the evolution of living organisms without reference to cytology would be as futile as an account of stellar evolution which ignored spectroscopy.

Reality is the cage of those who lack imagination.

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.

It seems to me immensely unlikely that mind is a mere by-product of matter. For if my mental processes are determined wholly by the motions of atoms in my brain I have no reason to suppose that my beliefs are true. They may be sound chemically, but that does not make them sound logically. And hence I have no reason for supposing my brain to be composed of atoms.

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

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.

Christianity is haunted by the theory of a God with a craving for bloody sacrifices.