Discontent is the first necessity of progress.

I didn't fail 1000 times. The light bulb was an invention with 1000 steps.

I never pick up an item without thinking of how I might improve it.

Time is really the only capital that any human being has, and the only thing he can't afford to lose.

I find my greatest pleasure, and so my reward, in the work that precedes what the world calls success.

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 dove is my emblem.