Actually that's the point. You can't live your life regretting the past and living today trying to manipulate the future. Whatever happened, it happened. And whatever happens, happens.
Death is a good example; You can regret that you smoked when you were young, live healthy today, and hope that you won't get lung cancer tomorrow. But in the end, you can't change what you did in the past or how it will affect the future. You can only live today.
Caption this Meme 
