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

An expert is one who knows more and more about less and less.

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

I divide the world into three Classes - The few who make things happen, the many who watch things happen, the overwhelming majority who have no notion of what happens.

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.

America is the best half-educated country in the world.

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