The teacher, whether mother, priest, or schoolmaster, is the real maker of history.

I write to cover a frame of ideas.

Man ... can go up against gravitation in a balloon, and why should he not hope that ultimately he may be able to stop or accelerate his drift along the Time-Dimension, or even turn about and travel the other way.

In politics, strangely enough, the best way to play your cards is to lay them face upwards on the table.

A biography should be a dissection and demonstration of how a particular human being was made and worked.

It sounds plausible enough tonight, but wait until tomorrow. Wait for the common sense of the morning.

While there is a chance of the world getting through its troubles, I hold that a reasonable man has to behave as though he were sure of it. If at the end your cheerfulness in not justified, at any rate you will have been cheerful.