Genesis 18:23-33.

Towards the end, a beautifully written description of the minds and actions of psychopaths. Could be applied to the ISIS maimers/murderers of today. Less a matter of judgement than of megalomania -- selfish ego x greed = evil.

"And then I realized--like I was shot...like I was shot with a diamond...a diamond bullet right through my forehead. And I thought, "My God, the genius of that, the genius, the will to do that." Perfect, genuine, complete, crystalline, pure. And then I realized they could stand that--these were not monsters, these were men, trained cadres, these men who fought with their hearts, who have families, who have children, who are filled with love--that they had this strength, the strength to do that. "

...and for that, I give you the Nihilist, the anti-god atheist, Friedrich Nietzsche:

"Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you."

Funny how Nietzsche could dispense the punchline so beautifully and also having not seen this movie either.

Kurtz, "Are you an assassin?"

Willard, "I'm a soldier."

Kurtz, "You're neither. You're an errand boy, sent by grocery clerks, to collect a bill."