How does the speakers metaphor of the mirage in paragraph 4 support the purpose of the speeh?

What is wong with this sentence cameron, who has an extreme and unreasonable suspicion of other people and their motives, suffers from paranoia which is a psychological disorder characterized by delusions of persecution or grandeur, was absolutely sure that someone was following him even though he was absolutely alone and hadn't seen a car for miles and miles.

  which statement describes the main argument of truth’s speech

How does the reputation of the author convey authority? from ''city upon a hill''