In The Great Gatsby, what does Nick observe "has its limits"?
In chapter one, Nick begins the story by describing how fortunate he feels to have had a superior upbringing. He credits his father's advice and prides himself on his broad-mindedness and nonjudgmental nature and observes that these qualities have led many men to confide in him. To finish your quotation, it is Nick's tolerance that "has its limits." Nick will tell the story of his summer in New York and his friendship with Gatsby retrospectively, and he implies that whatever he has learned about human nature has in some way scarred him emotionally. He declares that at least temporarily, he does not want to be the person that others confide in, and he is uninterested in the ups and downs of other people's lives.