Speech is human nature itself, with none of the artificiality of written language.

Education is the acquisition of the art of the utilisation of knowledge.

Imagination is not to be divorced from the facts. It is a way of illuminating the facts.

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

True courage is not the brutal force of vulgar heroes, but the firm resolve of virtue and reason.

The true method of discovery is like the flight of an aeroplane. It starts from the ground of particular observation; it makes a flight in the thin air of imaginative generalization; and it again lands for renewed observation rendered acute by rational interpretation.

It is the business of the future to be dangerous.