Just because something doesn't do what you planned it to do doesn't mean it's useless.

Being busy does not always mean real work. The object of all work is production or accomplishment and to either of these ends there must be forethought, system, planning, intelligence, and honest purpose, as well as perspiration. Seeming to do is not doing.

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

The first requisite for success is to develop the ability to focus.

In creating technology for ourselves we created it for the world.

Most of the exercise I get is from standing and walking around laboratory tables all day. I derive more benefit and entertainment from this than some of my friends and competitors get from playing games like golf.

The radio craze will die out in time.