Look back, remember, smile, then move on.
Never forget where you came from. If we forget where we came from and what made us who we are now, then we will have no foundation to stand up on, and we will eventually crumble. Whether you love your past or completely loathe it, you must know that you will never be able to completely put your past behind you, sooner or later it will creep back into your thoughts, like it or not. So, make the best of it.