Part 1 of Essay
Now Thomas laughed. "You're blind!" (p. 84) By accusing the Martian of being blind the human achieves three things. First, he is trying to redeem his pride by making the Martian feel silly. Second, he is trying to distract himself from the real issue by making fun and laughing, because he cannot deal with his feeling ....

Part 2 of Essay
.... and superior beings and isolated in contrast to such an immense universe. Humans must eventually accept their true worth in this universe, however unpleasant it may be, for knowledge is always more valuable than ignorance. ....