“A problem well stated is a problem half solved.”

“It doesn't matter if you try and try and try again, and fail. It does matter if you try and fail, and fail to try again.”

“An inventor fails 999 times, and if he succeeds once, he's in. He treats his failures simply as practice shots.”

“Keep on going and the chances are you will stumble on something, perhaps when you are least expecting it. I have never heard of anyone stumbling on something sitting down.”

“The Wright brothers flew right through the smoke screen of impossibility.”

“We should all be concerned about [the future] because we will have to spend the rest of our lives there!”

“Believe and act as if it were impossible to fail.”