The analytical geometry of Descartes and the calculus of Newton and Leibniz have expanded into the marvelous mathematical method

Optimism is the foundation of courage.

The world is divided into three kinds of people: A very small group that makes things happen; a somewhat larger group that watches things happen; and a great multitude that never knows what has happened.

The fifth freedom, the Freedom of Individual Enterprise, is the keystone of the arch on which the other Four Freedoms rest. This is what freedom means.

Time was invented by the Almighty God in order to give ideas a chance.

To exclude religious teaching altogether from education... is a very dangerous and curious tendency. The result is to give paganism a new importance and influence.

Many peoples tombstones should read, 'Died at 30. Buried at 60.'