It is nothing short of a miracle that modern methods of teaching have not yet entirely strangled that sacred spirit of curiosity and inquiry, for this delicate plant needs freedom no less than stimulation.

It is not by sitting still at a grand distance and calling the human race larvae that men are to be helped.

Let every man judge according to his own standards, by what he has himself read, not by what others tell him.

The truth of a theory is in your mind, not in your eyes.

When I was young, all I wanted and expected from life was to sit quietly in some corner doing my work without the public paying attention to me. And now see what has become of me.

Live with purpose. Don't let people or things around you get you down.

Man's will, sustained by an indominable conviction, is much more powerful than material forces that seem insurmountable.