Success makes men rigid and they tend to exalt stability over all the other virtues; tired of the effort of willing they become fanatics about conservatism.

There is but one bond of peace that is both permanent and enriching: The increasing knowledge of the world in which experiment occurs.

We know that it is possible to harness desire to many interests, that evil is one form of a desire, and not the nature of it.

What each man does is based not on direct and certain knowledge, but on pictures made by himself or given to him...

Nobody has yet found a way of bombing that can prevent foot soldiers from walking.

Our conscience is not the vessel of eternal verities. It grows with our social life, and a new social condition means a radical change in conscience.

Happiness cannot be the reward of virtue; it must be the intelligible consequence of it.