How can we ever agree?

I must share this quote I have come across as I believe it ought to be a fundamental guildeline of human intercourse. It is a statement that once I read it realized I had always believed and sought within myself to achieve. It is sound advice for the serious shaper of souls.

"Argument, properly understood and subject always to charity, is merely a dialogue in which both parties intend to arrive at the truth, or at least end up closer to it. The argument must never deteriorate into a quarrel, something which must be considered scandalous among Christians of whatever persuasion, but if we do not argue these issues how can we ever agree--even if ultimately we only agree to differ?" (Joseph Pearce, C.S. Lewis and the Catholic Church, XXX)