While driving, the rearview mirror is an important tool.
Every once in a while you need to glance back and see what is behind you. However, most of the time you are focused on looking out the windshield to prepare for what's ahead. Often, the two intertwine as looking behind you helps prepare you for what will happen up ahead.
It's similar to life, I thought as I was driving the other day. Now, it's not a perfect analogy, but in life we do have to take into consideration what's behind us. We can learn from what has happened in the past and use that as we move into the future.
Our past shouldn't slow us down though. If we look into the rearview mirror too long, taking our eyes off of what is up ahead, we might get into a car crash. The rearview mirror is a helpful tool, but it's not everything. Our pasts also aren't everything. We can't dwell on what's behind us and forget about what is ahead.
The past is important, but whether good or bad, we can do whatever we want in the future. The road is wide open, and it's up to us - and God, if we only trust him - where we go.