The vigor of civilized societies is preserved by the widespread sense that high aims are worth-while.

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

It is the business of the future to be dangerous.

Art flourishes where there is a sense of adventure.

A man of science doesn't discover in order to know, he wants to know in order to discover.

The study of mathematics is apt to commence in disappointment... We are told that by its aid the stars are weighed and the billions of molecules in a drop of water are counted. Yet, like the ghost of Hamlet's father, this great science eludes the efforts of our mental weapons to grasp it.

Rightness of limitation is essential for growth of reality.