Why does Nick think he is one of the most homest people he knows?

http://www.gradesaver.com/the-great-gatsby/q-and-a/nick-thinks-hes-one-of-the-few-honest-people-he-knows-why-do-you-think-he-is-honest-65175/

Jane is one of the few people whom Holden speaks about in entirely positive terms; he is basically in love with her. Holden's letter sure would be stilted. He would be trying to express his admiration for her couched in a lot of negativity and sarcasm. This isn't an easy letter to pull off but good luck!