Mistake
"It was a mistake. I know it was a mistake. But there are certain things in life where you know it's a mistake but you don't really know it's a mistake because the only way to really know it's a mistake is to make the mistake, and look back, and say, "Yep. That was a mistake." So, really, the bigger mistake would have been to not make the mistake, because then you go your whole life not really knowing if something was a mistake or not."