If a ship has been sunk, I can't bring it up. If it is going to be sunk, I can't stop it. I can use my time much better working on tomorrow's problem than by fretting about yesterday's. Besides, if I let those things get me, I wouldn't last long.
Jimmy Snuka stood up, 25 feet in the air, drove his knee through my ribs, but did I allow them to carry me out on a strecher? NO! I got right up and walked out!