What do we see in the rear view mirror?

How many of us are afraid to look back, or spend all of our time looking back?  What should we see?  What do we think we’d like to see?  Does it ever really matter as much as we think it should?

Even as I sit still, waiting to move I gaze in the mirror, always wondering what’s coming behind me and staring through my windshield at what’s coming.  How many of the things in my rear view am I running from?  How many of the things should I run from?  Is there any way I can know ahead of time?