The whole of mathematics consists in the organization of a series of aids to the imagination in the process of reasoning.

Disputing the commonsense notion that all events require the prior existence of some underlying matter or substance. There is no antecedent static cabinet.

A science which hesitates to forget its founders is lost.

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

The ultimate metaphysical ground is the creative advance into novelty.

Heaven knows what seeming nonsense may not tomorrow be demonstrated truth.

It is natural to think that an abstract science cannot be of much importance in affairs of human life, because it has omitted from its consideration everything of real interest.