: a wistful or excessively sentimental yearning for return to or of some past period or irrecoverable conditionLooking back can be a good thing but it also can be something that destroys us (look at what happened to Lot's wife when she physically looked back). It is a time that can help us trace God's hand in our lives- a time that helped build our characters- a time that shows us who really matters in our lives and who our true friends are. However, too often we dwell on the past and let it take hold of us in ways that we can't even fully understand. It can affect our present and our future in negative ways- IF we let it.
The important thing to remember is that we can't go forward if we are looking behind us. Paul addresses it in Philippians 3:12-14: