That knowledge which adds greatness to character is knowledge so handled as to transform every phase of immediate experience.

Education with inert ideas is not only useless; it is above all things harmful.

The vitality of thought is in adventure. Ideas won't keep. Something must be done about them. When the idea is new, its custodians have fervor, live for it, and if need be, die for it.

Nobody has a right to speak more clearly than he thinks.

Every really new idea looks crazy at first.

It is in literature that the concrete outlook of humanity receives its expression.

I am sure that one secret of a successful teacher is that he has formulated quite clearly in his mind what the pupil has got to know in precise fashion. He will then cease from half-hearted attempts to worry his pupils with memorizing a lot of irrelevant stuff of inferior importance.