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

The inventor tries to meet the demand of a crazy civilization.

Barring serious accidents, if you are not preoccupied with worry and you work hard, you can look forward to a reasonably lengthy existence.... Its not the hard work that kills, its the worrying that kills.

The doctor of the future will give no medicine, but will involve the patient in the proper use of food, fresh air and exercise

To do much clear thinking a person must arrange for regular periods of solitude when they can concentrate and indulge the imagination without distraction.

Your worth consists in what you are and not in what you have.