Batman is apparently heavily inspired by the philosophy of Nietzche. The quote is probably a more polished version of this one from Beyond Good and Evil: "He w

Batman is apparently heavily inspired by the philosophy of Nietzche. The quote is probably a more polished version of this one from Beyond Good and Evil: "He who fights monsters should see to it that he himself does not become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." So maybe somewhat German after all. Source: https://movies.stackexchange.com/questions/10572/is-this-quote-originally-from-the-dark-knight https://movies.stackexchange.com/questions/10572/is-this-quo...