"The wages of sin is death, and your debt is now paid," is a reference to the Bible verse Romans 6:23, "For the wages of sin is death, but the gift of God is eternal life in Christ Jesus our Lord."
"Better to reign in the Burning Hells, than serve in the High Heavens," is a reference to "Better to reign in Hell, than serve in Heaven," from John Milton's Paradise Lost.[1]
"Poke not the darkness, lest the darkness poke you," is a reference to "He who fights with monsters should be careful lest he thereby become a monster. And if thou gaze long into an abyss, the abyss will also gaze into thee," from Friedrich Nietzsche's Beyond Good and Evil.[2]
"Hell hath no fury like a woman swarmed," is a reference to William Congreve's "Heaven has no rage, like love to hatred turned, Nor hell a fury, like a woman scorned," from his play The Mourning Bride.
"I speak for the trees, for the trees have no tongues," is a reference to "I am the Lorax. I speak for the trees. I speak for the trees for the trees have no tongues," from The Lorax by Dr. Seuss.
"Mischief managed! Oh whoops! Sorry! Wrong kind of marauder," (available with the Maraudin' Muradin skin) is a reference to the Marauder's Map from the Harry Potter novels.
"Goodnight forest. Goodnight tortoise. Goodnight caves, and goodnight glaves. Goodnight Feathermoon, and good night Elune," is a reference to children's book Goodnight Moon by Margaret Wise Brown.