I've realized that most of my best ideas have followed a good night's sleep.

I was always afraid of things that worked the first time. Long experience proved that there were great drawbacks found generally before they could be got commercial; but here was something there was no doubt of.

The thing I lose patience with the most is the clock. Its hands move too fast

My success is due more to my ability to work continuously on one thing without stopping than to any other single quality.

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

The money one gets for selling one's soul is always spent in deadening one's conscience, so the net gain at the end of a lifetime is no greater than if the diabolic bargain had not been struck.

Many of life's failures are people who did not realize how close they were to success when they gave up.