Houyhnhnms and, as a result, begins to despise anything else, including those of his own race. The fact that Gulliver wants to be accepted as a Houyhnhnm is also an indication that he is slipping into insanity. Gulliver believes, "the Yahoos . . . were observed to be the most unteachable of all brutes" (227). Here we see how Gulliver is belittling himself while he belittles the Yahoos. Gulliver knows what he is but believes that he can change because of the Yahoos repulsive nature.
Gulliver is an example of what can happen
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