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Nick's carefulness when saying something reveals the fact that he makes good judgments. An example of his good judgments is when he said that Tom and Daisy was careless people because throughout the novel evidences can be found to support this statement. "They were careless people, Tom and Daisy they smashed up thing and creatures and then retreated back into their money or their vast carelessness, or whatever it kept them together, and let other people clean up the mess they had made."" (Pg. 180-1) Nick shows his good judgment of Tom and Daisy being careless people. On the contrary, Tom makes baseless judgments that are visible in the following quote. "Nowadays people begin by sneering at family life and family institutions, and next they'll throw everything overboard and have intermarriage between black and white. (Pg. 130) This quote reveals how Tom scorns the blacks for no apparent reason. Nick's reasonable judgments reflect reality, for he sees things as they really are. On the other hand, Tom's baseless judgments reflect the illusions in his world, for his judgments are what he only views to be right. .
Nick and Tom's ability to make judgments reveal how good of judgments they make in their relationships. Nick is honest in his relationships. Before going back to the mid-west, he went and talked to Jordan about their relationship, as the following quote reveals:.
"There was one thing to be done before I left, and awkward, unpleasant thing that perhaps had better been left alone. But I wanted to leave things in order and not just trust that obliging and indifferent sea to sweep my refuse away I saw Jordan Baker and talked over and around what had happened to us together, and to us together, and what happened afterward to me."" (Pg. 178).
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This shows how Nick wants to be honest about how he feels towards Jordan. On the other hand, Tom is dishonest in relationships; not only was he cheating on his wife, but he also lied to his mistress, as the quote indicates- "You see, cried Catherine Triumphantly.