We must produce a great age, or see the collapse of the upward striving of our race.

Whenever a text-book is written of real educational worth, you may be quite certain that some reviewer will say that it will be difficult to teach from it. Of course it will be difficult to teach from it. It it were easy, the book ought to be burned.

Great art is more than a transient refreshment. It is something which adds to the permanent richness of the soul's self-attainment. It justifies itself both by its immediate enjoyment, and also by its discipline of the inmost being. Its discipline is not distinct from enjoyment but by reason of it. It transforms the soul into the permanent realization of values extending beyond its former self.

It must be admitted that there is a degree of instability which is inconsistent with civilization. But, on the whole, the great ages have been unstable ages.

The aim of science is to seek the simplest explanation of complex facts... Seek simplicity and distrust it.

Science repudiates philosophy. In other words, it has never cared to justify its truth or explain its meaning.

An enormous part of our mature experience cannot not be expressed in words.