There is no greater hindrance to the progress of thought than an attitude of irritated party-spirit.

We think in generalities, but we live in detail.

War can protect; it cannot create.

One main factor in the upward trend of animal life has been the power of wandering.

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.

Systems, scientific or philosophic, come and go. Each method of limited understanding is at length exhausted. In its prime each system is a triumphant success: in its decay it is an obstructive nuisance.

Error is the price we pay for progress.