Gregory House, on failure.

Dr Nolan: Why do you value your failures more than your successes?
House: My mother caught me masturbating... to pictures of her mother.
Dr Nolan: Can we get past these cute deflections?
House: I don't know. I didn't realize that I did until this precise moment. But you're right. I do.
Successes only last until someone screws them up.
Failures last forever.