Dogmatism is the anti-Christ of learning.

Human life is driven forward by its dim apprehension of notions too general for its existing language.

Without adventure all civilization is full of decay. Adventure rarely reaches its predetermined end. Columbus never reached China.

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

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

Nature gets credit which should in truth be reserved for ourselves: the rose for its scent, the nightingale for its song; and the sun for its radiance. The poets are entirely mistaken. They should address their lyrics to themselves and should turn them into odes of self congratulation on the excellence of the human mind.

Education should turn out the pupil with something he knows well and something he can do well.