Of the 200 light bulbs that didn't work, every failure told me something that I was able to incorporate into the next attempt.

Before you reject an idea, find at least five good things about it.

I start where the last man left off. What the mind of man can conceive and believe, the mind of a man can achieve.

The biggest failure of man is that he gives up before he realizes how close he was to success.

As a cure for worrying, work is far better than whiskey. I always found that, if I began to worry, the best thing I could do was focus upon doing something useful and then work very hard at it. Soon, I would forget what was troubling me.

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

My success is due more to my ability to work continuously on one thing without stopping than to any other single quality.