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.

The chief function of the body is to carry the brain around.

I have better use for my brain than to poison it with alcohol. To put alcohol in the human brain is like putting sand in the bearings of an engine.

My principal business is giving commercial value to the brilliant - but misdirected - ideas of others.

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.

To have a great idea, have a lot of them.

Nobody knows whether our personalities pass on to another existence or sphere, but if we can evolve an instrument so delicate to be manipulated by our personality as it survives in the next life such an instrument ought to record something.