It's what Christ was talking about when he said (paraphrasing) "Look at the animals; no worry about tomorrow, no dwelling on yesterday, just living ONE DAY AT A TIME."
I've seen lots of animals, once the blood and pain subside, get up on that severed limb and just keep going - no crying about a football career, the loss of dancing...they just carry on. It's how we were designed to work...we just choose to fail instead: it's called sin. A design flaw. That's why we're here.