2 of the best quotes on this occur at the end of the article:

Perhaps the most important consideration for the Christian is to remain aware at all times of the goal to be achieved. It is the consistent perception of this goal that will give a basic orientation to the whole discussion: Are we attempting to win an argument in order to manifest our own superior knowledge and debating ability? Or are we seeking to win another person whom we perceive as enmeshed in error or inadequacy by exposing him or her to the truth and light that God has given to us?…

A Christian in carrying on discussions with those who differ should not be subject to the psychology of the boxing ring where the contestants are bent upon demolishing one another. Rather “The Lord’s servant must not quarrel: instead, he must be kind to everyone, able to teach, not resentful. Those who oppose him he must gently instruct, in hope that God will grant them repentance leading them to a knowledge of the truth, and that they will come to their senses…” (2 Timothy 2:24-26).