"Never do I argue with a man with a desire to hear him say what is wrong, or to expose him and win victory over him. Whenever I face an opponent in debate I silently pray - O Lord, help him so that truth may flow from his heart and on his tongue, and so that if truth is on my side, he may follow me; and if truth be on his side, I may follow him." --Imam Al-Shafi'i
Found this quote on the Zaytuna website today. Definately food for thought.