The vitality of thought is in adventure. Idea's won't keep. Something must be done about them. When the idea is new, its custodians have fervour, live for it, and, if need be, die for it. Their inheritors receive the idea, perhaps now strong and successful, but without inheriting the fervour; so the idea settles down to a comfortable middle age, turns senile, and dies.

Philosophy asks the simple question: What is it all about?

Philosophy is the product of wonder.

[In many circumstances,] the most important thing about a proposition is not that it be true, but that it be interesting.

Mathematics, in its widest significance, is the development of all types of formal, necessary, deductive reasoning.

A great society is a society in which its men of business think greatly of their functions.

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.