The quote means He must be taking care of His Father's business, which is to serve a huge, vulgar, and pretentious beauty. As a result, he created Jay Gatsby in exactly the way a seventeen-year-old lad would, and he stuck to this idea throughout.
This startling analogy between Gatsby and Jesus Christ is used by Nick in Chapter 6, when he finally explains Gatsby's early past, to shed light on how Gatsby constructed his own identity. Fitzgerald most likely took inspiration from Ernest Renan's book The Life of Jesus, published in the nineteenth century, when he drew this comparison. In this book, Jesus is depicted as someone who basically opted to claim that he was the son of God and then brought himself to ruin by refusing to acknowledge the truth that refuted his self-conception ." Renan's work appears to have inspired Fitzgerald, who is known to have loved it, when he came up with this metaphor. Even while the comparison between Gatsby and Jesus isn't a major theme in The Great Gatsby, it is nevertheless suggestive since Gatsby becomes the ideal that he had as a child (what Plato called his "Platonic image of oneself") and sticks to that ideal despite the challenges that society puts in his way to realising that dream.
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