善惡到底是誰勝誰負，我們封印得住那通往魔界的門，但人心 魔性，誰又知道結果如何呢？- 斷腸人
Hits me pretty hard. It may be simple to read as good and evil, But i get the reference to the good and evil within ourselves.
I would like to translate to this: You can do all you need to seal off all the channels that feeds you bad/negative thoughts. But who knows if these negative thoughts stems from yourself.