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

Cherish yesterday. dream tomorrow, live like crazy today!!

The forty-four-hour week has no charm for me. I'm looking for a forty-hour day.

Persecution on racial and religious grounds has absolutely no place in a nation given over to liberty.

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

There are many things that go to make up an education, but there are just two things without which no man can ever hope to have an education and these two things are character and good manners.

The words that bore the deathless verse of Homer from bard to a group of fascinated hearers, and with whose fading sounds the poems passed beyond recall, are fixed on the printed page in a hundred tongues. They carry to a million eyes what once could reach but a hundred ears.

The epitaphs on tombstones of a great many people should read: Died at thirty, and buried at sixty.

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.

Optimism is the foundation of courage.

Fundamentally, the force that rules the world is conduct, whether it be moral or immoral. If it is moral, at least there may be hope for the world. If immoral, there is not only no hope, but no prospect of anything but destruction of all that has been accomplished during the last 5,000 years.

Optimism is essential to achievement and it is also the foundation of courage and true progress.

This desire of knowledge and the wonder which it hopes to satisfy are the driving power behind all the changes that we, with careless, question-begging inference, call progress.