You have nothing to learn from people like you.

 Have you noticed, you have nothing to learn from someone who thinks exactly the way you do.

Agree?
Yet, we like to get surrounded ourselves with our intellectual replicas.
Yes, it's true.
Further, We befriend people who think like us.
We hire people who followed the same path that we did.
Opening your mind requires opening your door.
You need other people—with different life experiences and viewpoints, to see possibilities that you miss, and make you aware of your short- comings, and alert you time to time.
If you’re Andre Agassi, you need Pete Sampras to keep you on your toes with a powerful serve.