Art flourishes where there is a sense of adventure, a sense of nothing having been done before, of complete freedom to experiment.

There are no whole truths: all truths are half-truths. It is trying to treat them as whole truths that plays to the devil.

To see what is general in what is particular, and what is permanent in what is transitory, is the aim of scientific thought.

No science can be more secure than the unconscious metaphysics which tacitly it presupposes.

Rightness of limitation is essential for growth of reality.

The study of mathematics is apt to commence in disappointment.

There will be some fundamental assumptions which adherents of all the variant systems within the epoch unconsciously presuppose. Such assumptions appear so obvious that people do not know what they are assuming because no other way of putting things has ever occurred to them. With these assumptions a certain limited number of types of philosophic systems are possible, and this group of systems constitutes the philosophy of the epoch.