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.

The result of teaching small parts of a large number of subjects is the passive reception of disconnected ideas, not illumed with any spark of vitality.

You may not divide the seamless coat of learning.

It is the business of the future to be dangerous.

Learning preserves the errors of the past, as well as its wisdom. For this reason, dictionaries are public dangers, although they are necessities.

No one who achieves success does so without acknowledging the help of others. The wise and confident acknowledge this help with gratitude.

Aristotle discovered all the half-truths which were necessary to the creation of science.