Looking back at our past we can take what had happened then as a lesson or a learning opportunity to better how we would approach something in the future. We look at our mistakes and disappointments and use that to motivate ourselves in any given situation in the future to help us understand it and solve it knowing the mistakes we made and what needs to be done to not make them again or to improve. Our past helps us understand how we would look at things in the future, in a more mature and stable way.