See in Two Places

Something I've learned is that when I'm looking behind me, I can't see ahead of me.
Are you saying that dwelling on my past is holding me back?
No, I literally can't see over there when I'm looking back there. Which is why it's good to have you here. Together, we can see in two places at once.

Dirk Gently and Todd Brotzman from Dirk Gently's Holistic Detective Agency "Very Erectus"

It is always good to have someone watching your back, because your perspective may not allow you to see what someone else can see quite clearly. Plus listening to someone else's thoughts will make them feel respected and it may endear them to you.