Looking back now and then helps you learn the lessons of life and determine positive steps forward, but to continually look back mires you in the past and a life that doesn't exist anymore. So it is important to not look back all the time but instead to look ahead to the new chapter you live in now and those chapters ahead of that.
I thought about this recently as I found myself seeking solutions to current problems in past efforts. While the past efforts shed light on the current situation, the answers to these issues does not lie in the past, but instead exist in the present and future.
In many ways, it is time to cut ties with past endeavor, mindsets and connections--it's time to build anew with confidence, good energy and new vision. Onward.