Opposition is indispensable

"Opposition is indispensable. People will always learn more from those who disagree with them from those who share their views."
I do not believe that we learn more from people who disagree fully with us. We learn more from those who only slightly disagree with us. I know that if I have an argument with someone I tend to get completely turned off to what they are trying to say to me if their viewpoint is the opposite than mine. An example of this is if I was having an argument with a person about Christianity and they believe that Jesus did not exist then I would not learn much from them because I believe that he did exist. It is very seldom that a person will just completely change their views of the world based on subjective evidence sometimes even if presented with objective evidence. I learn from those who merely have modified views of my same viewpoint. My uncle and I used to have conversations about philosophy and things of that nature. For the most part we had similar viewpoints but every once and awhile we would agree on a means but not an end or an end but not a means. Since he is older and has more schooling I found that I learned a lot from him and many of my views were "redirected" in certain way. I have an aunt with whom I disagree with much of her philosophical views and even though I love her I learn little from her except some things about conflicting world-views. It is hard to make an entire 180.