Do not teach too many subjects and what you teach, teach thoroughly.

Knowledge keeps no better than fish.

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.

Education which is not modern share the fate of all organic things which are kept too long.

No religion can be considered in abstraction from its followers, or even from its various types of followers.

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.

It is the business of future to be dangerous.... The major advances in civilization are processes that all but wreck the societies in which they occur.