But you can catch yourself entertaining habitually certain ideas and setting others aside; and that, I think, is where our personal destinies are largely decided.

People make the mistake of talking about 'natural laws.' There are no natural laws. There are only temporary habits of nature.

You may not divide the seamless coat of learning.

To see what is general in what is particular, and what is permanent in what is transitory, is the aim of scientific thought.

In the history of the world the prize has not gone to those species which specialized in methods of violence, or even in defensive armor. In fact, nature began with producing animals encased in hard shells for defense against the ill of life. But smaller animals, without external armor, warm-blooded, sensitive, alert, have cleared those monsters off the face of the earth.

A great society is a society in which its men of business think greatly of their functions.

Youth is life as yet unblemished by much tragedy, but hardly by TV.