To invent, you need a good imagination and a pile of junk.

I never quit until I get what I want.

Fools call wise men fools. A wise man never calls any man a fool.

The greatest invention in the world is the mind of a child.

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

It is apparent to me that the possibilities of the aeroplane, which two or three years ago were thought to hold the solution to the [flying machine] problem, have been exhausted, and that we must turn elsewhere.

Genius is 99% perspiration and 1% inspiration.