John Newton on controversy.

How do we deal with our brothers and sisters when we have a doctrinal disagreement?  John Newton wrote a letter called "On controversy" in which he counseled a pastor who was in a disagreement with another pastor.  This letter is a must read, may we all deal with one another in this way everytime we disagree!  Nathan Bingham at Ligonier Ministries has posted this letter and I was challenged by it's contents.