All progress has resulted from people who took unpopular positions. All change is the result of a change in the contemporary state of mind.

A hypocrite is the kind of politician who would cut down a redwood tree, then mount the stump and make a speech for conservation.

The university is the archive of the Western mind, it's the keeper of the Western culture, ... the guardian of our heritage, the teacher of our teachers, ... the dwelling place of the free mind.

In America any boy may become President, and I suppose it's just one of the risks he takes.

Freedom rings where opinions clash.

Nature is neutral. Man has wrested from nature the power to make the world a desert or make the deserts bloom. There is no evil in the atom; only in men's souls.

That which seems the height of absurdity in one generation often becomes the height of wisdom in another.