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

Seek simplicity, and distrust it.

Speak out in acts; the time for words has passed, and only deeds will suffice.

In a sense, knowledge shrinks as wisdom grows, for details are swallowed up in principles. The details for knowledge which are important, will be picked up ad hoc in each avocation of life, but the habit of the active utilization of well-understood principles is the final possession of WISDOM.

From the very beginning of his education, the child should experience the joy of discovery.

There are two principles inherent in the very nature of things, recurring in some particular embodiments whatever field we explore - the spirit of change, and the spirit of conservation. There can be nothing real without both. Mere change without conservation is a passage from nothing to nothing. . . . Mere conservation without change cannot conserve. For after all, there is a flux of circumstance, and the freshness of being evaporates under mere repetition.

An enormous part of our mature experience cannot not be expressed in words.