Science tells us how to heal and how to kill; it reduces our death rate in retail and then kills us wholesale in war; but only wisdom - desire coordinated in the light of all experience - can tell us when to heal and when to kill.

Woe to him who teaches men faster than they can learn.

The finger that turns the dial rules the air.

Civilization exists by geological consent, subject to change without notice.

A history of civilization shares the presumptuousness of every philosophical enterprise: it offers the ridiculous spectacle of a fragment expounding the whole. Like philosophy, such a venture has no rational excuse, and is at best but a brave stupidity; but let us hope that, like philosophy, it will always lure some rash spirits into its fatal depths.

Civilization is the order and freedom is promoting cultural activity.

The great snare of thought is uncritical acceptance of irrational assumptions.