It must be admitted that there is a degree of instability which is inconsistent with civilization. But, on the whole, the great ages have been unstable ages.

It is the business of the future to be dangerous.

The consequences of a plethora of half-digested theoretical knowledge are deplorable.

I am also greatly indebted to Bergson, William James, and John Dewey. One of my preoccupations has been to rescue their type of thought from the charge of anti-intellectualism, which rightly or wrongly has been associated with it.

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

The tragedy of the world is that those who are imaginative have but slight experience, and those who are experienced have feeble imaginations.

The fixed person for the fixed duties who in older societies was such a godsend, in future will be a public danger.