The value of a good idea is in using it.

The great trouble is that the preachers get the children from six to seven years of age and then it is almost impossible to do anything with them.

When down in the mouth, remember Jonah. He came out all right.

We will make electricity so cheap that only the rich will burn candles.

Opportunity is missed by most people because it is dressed in overalls and looks like work.

I would construct and work along various lines until I found them untenable. When one theory was discarded, I developed another at once. I realized very early that this was the only possible way for me to work out all the problems.

I think work is the world's greatest fun.