The world owes nothing to any man, but every man owes something to the world.

The real measure of success is the number of experiments that can be crowded into 24 hours.

If I had not had so much ambition and not tried to do so many things, I probably would have been happier, but less useful.

I never did a day's work in my life, it was all fun.

Results! Why, man, I have gotten a lot of results. I know several thousand things that won't work.

Personally, I enjoy working about 18 hours a day. Besides the short catnaps I take each day, I average about four to five hours of sleep per night.

The inventor can't do it all, you've got to change people. We have an enormous capacity to invent super-machinery. But our desire to install the device is weak. Human inertia is the problem, not invention. Something in man makes him resist change.