More on Thoughtful Argumentation

I've been reading How to Read a Book by Mortimer Adler.  This morning I came across the following quote that I felt fit well with my previous post about argumentation.  

"What is important is that there is an intellectual etiquette to be observed.  Without it, conversation is bickering rather than profitable communication.  We are assuming here, of course, that the conversation is about a serious matter on which men can agree or disagree.  Then it becomes important that they conduct themselves well.  Otherwise, there is no profit in the enterprise.  The profit in good conversation is something learned."  (page 138)