The reader may wonder, Gulliver says, how he could bring himself to describe his own species so freely. Humans and the Yahoos of that country are so alike that the Houyhnhnms were already inclined to think the worst of humankind.
He confesses it frankly. The many virtues of those excellent quadrupeds, set against human corruption, had opened his eyes. He began to see human actions and passions in a very different light, and to think the honour of his own kind not worth defending.
Besides, it would have been impossible before so sharp a judge as his master. Every day the master showed him a thousand faults in himself he had never noticed before. Among us they would not even count as human weaknesses.