Progress is the increasing control of the environment by life.

A statesman cannot afford to be a moralist.

Nature smiles at the union of freedom and equality in our utopias. For freedom and equality are sworn and everlasting enemies, and when one prevails the other dies.

There have been only 268 of the past 3,421 years free of war.

Education is a progressive discovery of our own ignorance.

Those who have suffered much become very bitter or very gentle.

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