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

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

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

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

“When you have exhausted all possibilities, remember this; you haven’t.”