How the past perishes is how the future becomes.

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

An open mind is all very well in its way, but it ought not to be so open that there is no keeping anything in or out of it.

Imagination is not to be divorced from the facts. It is a way of illuminating the facts.

It requires a very unusual mind to undertake the analysis of the obvious.

Without adventure civilization is in full decay. ... The great fact [is] that in their day the great achievements of the past were the adventures of the past.

Some of the finest moral intuitions come to quite humble people. The visiting of lofty ideas doesn't depend on formal schooling.