The trouble with our times is that the future is not what it used to be.

What others think of us would be of little moment did it not when known so deeply tinge what we think of ourselves.

The universe is built on a plan the profound symmetry of which is somehow present in the inner structure of our intellect.

A man who is "of sound mind" is one who keeps the inner madman under lock and key.

Power without abuse loses its charm.

Politeness is organized indifference.

Science means simply the aggregate of all the recipes that are always successful. All the rest is literature.