Experience is the thing of supreme value".

Thinking is the hardest work there is, which is probably the reason why so few engage in it.

I am in exact accord with the belief of Thomas Edison that spirit is immortal, that there is a continuing center of character in each personality. But I don't know what spirit is, nor matter either. I suspect they are forms of the same thing. I never could see anything in this reputed antagonism between spirit and matter. To me this is the most beautiful, the most satisfactory from a scientific standpoint, the most logical theory of life.

You say I started out with practically nothing, but that isn't correct. We all start with all there is, it's how we use it that makes things possible.

If you think you can do a thing or think you can't do a thing, you're right.

Quality means doing it right when no one is looking.

If I'd listened to customers, I'd have given them a faster horse.