Other nations of different habits are not enemies: they are godsends. Men require of their neighbours something sufficiently akin to be understood, something sufficiently different to provoke attention, and something great enough to command admiration. We must not expect, however, all the virtues.

No science can be more secure than the unconscious metaphysics which tacitly it presupposes.

Seek simplicity but distrust it.

Religion will not regain its old power until it can face change in the same spirit as does science.

The 'silly question' is the first intimation of some totally novel development.

No reason can be given for the nature of God, because that nature is the ground of rationality.

Without adventure civilization is in full decay.