If you would be wise, then make wide the spectrum of voices reaching your ear.
I considered the old adage from Bible in new light today. "In the multitude of counselors, there is safety," we are taught in Proverbs 11:14. I have always thought that meant no more than having counsel in order to be wise.
But, that word "multitude" hit me today. Does it suggest diversity? Does it imply that you listen to not just one line of thinking, but many?
If you would be wise, then listen to wisdom. You may not find it in your own thoughts, nor in the thoughts of people who think like you. If you too quickly reject those who do not think like you, you run the risk of rejecting wisdom. Wiser the person who listens to an enemy than the one who will only hear a friend.