The world is round. Everyone knows that. Yet there was a time when people believed that the world had corners. So just because you believe something is true... doesn't actually make it the truth does it?
Actions don't have consequences. They merely land you in situations where it depends entirely upon yourself how you react to it.
People say forget your past and focus on your future. But your past is the only thing that teaches you not to repeat your mistakes again. So treasure your past as it defines you today and will prepare you for your tomorrow