I am still a little afraid of missing something if I forget that, as my father snobbishly suggested, and I snobbishly repeat, a sense of the fundamental decencies is parcelled out unequally at birth.

from F. Scott Fitzgerald – The Great Gatsby (Chapter I) on Rap Genius

Meaning

The “fundamental decencies” here have to do with social graces: being well-adjusted, knowing the correct way to behave, etc.

Nick posits an aristocracy of ethics and values (“parcelled out unequally at birth”), which foreshadows (but also contrasts with) the aristocracy of money and power represented by the Buchanans.

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