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

Negative results are just what I want. They’re just as valuable to me as positive results. I can never find the thing that does the job best until I find the ones that don’t.

Each time you fail, you have eliminated another wrong option.

A failure teaches you that something can't be done-that way.

They say President Wilson has blundered. Perhaps he has, but I notice he usually blunders forward.