I read this today and I loved it. I like it in part because I know I can be a jerk when I am trying to argue a point, so I need to be careful. Undoubtly, the other part is because the jerks that I am arguing against should also read this quote and ponder it!
Nietzsche
Whoever fights monsters should see to it that in the process he does not become a monster. And when you look long into an abyss, the abyss also looks into you.