The three great essentials to achieve anything worthwhile are, first, hard work; second, stick-to-itiveness; third, common sense.

I have not failed. I've just found 10,000 ways that won't work.

Many of life's failures are people who did not realize how close they were to success when they gave up.

If we all did the things we are really capable of doing, we would literally astound ourselves.

No, I haven't failed thousands of times. On the contrary, I have successfully eliminated thousands of ideas that do not work!

If we did all the things we are capable of, we would literally astound ourselves.

Genius is one percent inspiration and ninety-nine percent perspiration.

Our greatest weakness lies in giving up. The most certain way to succeed is always to try just one more time.

Restlessness is discontent and discontent is the first necessity of progress. Show me a thoroughly satisfied man and I will show you a failure.