The tendency of the casual mind is to pick out or stumble upon a sample which supports or defies its prejudices, and then to make it the representative of a whole class.

It is easier to develop great power than it is to know how to use it wisely.

There is nothing so good for the human soul as the discovery that there are ancient and flourishing civilized societies which have somehow managed to exist for many centuries and are still in being though they have had no help from the traveler in solving their problems.

A man cannot be a good doctor and keep telephoning his broker between patients nor a good lawyer with his eye on the ticker.

The consent of the governed" is more than a safeguard against ignorant tyrants: it is an insurance against benevolent despots as well.

There is but one bond of peace that is both permanent and enriching: The increasing knowledge of the world in which experiment occurs.

Inevitably our opinions cover a bigger space, a longer reach of time, a greater number of things, than we can directly observe. They have, therefore, to be pieced together out of what others have reported and what we can imagine.