Success is stumbling from failure to failure with no loss of enthusiasm.

Of course I would have preferred success; but failing in that, I have no regrets for having rejected all advice to the contrary, and resolutely made the struggle.

I have tried 99 times and have failed, but on the 100th time came success.

The greatest glory in living lies not in never falling, but in rising every time we fall.

Success comes from failure, not from memorizing the right answers.

If something's important enough, you should try. Even if the probable outcome is failure.