How does Nick describe himself at the beginning of the novel?

Nick begins the story by telling us that he does not pass judgment on people. He says it is a trait passed on to him by his father. Nick comes from an upper middle class background. His father used to tell him to remember the advantages he had before passing judgment. Nick feels that, because of his accepting personality, people feel comfortable sharing confidential details of their lives. We will later see that Gatsby, who is a fiercely private person, ends up confiding in Nick.