I never once failed at making a light bulb. I just found out 99 ways not to make one.

My principal business is giving commercial value to the brilliant - but misdirected - ideas of others.

The man who doesn’t make up his mind to cultivate the habit of thinking misses the greatest pleasure in life.

The secret of success is focus of purpose.

Sleep is like a drug. Take too much at a time and it makes you dopey. You lose time and opportunities.

There is great value in disaster. All our mistakes are burned up. Thank God we can start a new.

Our greatest weakness lies in giving up.