Nick is relaying his father's advice " Whenever you feel like criticizing anyone, just remember that all the people in this world haven't had the advantages you've had."
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The main purpose of Nick's character is to function as an objective viewpoint of the lifestyle at East Egg. For much of the story he does give us a middle class objective view of the excess of the filthy rich. Nick's perspective gets a little blurred as the story ends but he still works well as our "guide" in the story.