Everything comes to him who hustles while he waits.

The only time I really become discouraged is when I think of all the things I would like to do and the little time I have in which to do them.

There will one day spring from the brain of science a machine or force so fearful in its potentialities, so absolutely terrifying, that even man, the fighter, who will dare torture and death in order to inflict torture and death, will be appalled, and so abandon war forever.

I can never pick up a thing without wishing to improve it.

Sleep is like a drug. Take too much at a time and it makes you dopey. You lose time and opportunities.

Two per cent. is genius, and ninety-eight per cent. is hard work.

Somewhere between the ages of eleven and fifteen, the average child begins to suffer from an atrophy, the paralysis of curiosity and the suspension of the power to observe. The trouble, I should judge, to lie with the schools.