Tim Keller on civil discourse, from Reason for God Introduction pp. xviii-xix:
Believers and nonbelievers will rise to the level of disagreement rather than simply denouncing one another. This happens when each side has learned to represent the other’s argument in its strongest and most positive form. Only then is it safe and fair to disagree with it. That achieves civility in a pluralistic society, which is no small thing.
Tim is talking about discourse between believers and unbelievers. How much more does this apply to discussions among believers?