Of the 200 light bulbs that didn't work, every failure told me something that I was able to incorporate into the next attempt.

His genius he was quite content in one brief sentence to define; Of inspiration one percent, of perspiration, ninety nine.

I have a peculiar theory about radium, and I believe it is the correct one. I believe that there is some mysterious ray pervading the universe that is fluorescing to it. In other words, that all its energy is not self-constructed but that there is a mysterious something in the atmosphere that scientists have not found that is drawing out those infinitesimal atoms and distributing them forcefully and indestructibly.

To get a great idea, come up with lots of them.

When I have eliminated the ways that will not work, I will find the way that will work.

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

Youth doesn't take advice.