Continued innovation is the best way to beat the competition.

I did not fail two thousand times. I merely found two thousand ways not to make a lightbulb.

Genius is 99% perspiration and 1% inspiration.

My main purpose in life is to make money so I can afford to go on creating more inventions.

I am afraid of radium and polonium ... I don't want to monkey with them.

I owe my success to the fact that I never had a clock in my workroom. Seventy-five of us worked twenty hours every day and slept only four hours - and thrived on it.

I think work is the world's greatest fun.