What changed gulliver in the final voyage and why?

Gulliver has come to love the Houyhnhnms, their society, and their way of living. He writes, "I had not been a Year in this Country, before I contracted such a Love and Veneration for the Inhabitants, that I entered on a firm resolution never to return to human Kind, but to pass the rest of my Life among these admirable Houyhnhnms in the Contemplation and practice of every Virtue." Gulliver decides that humans are inherently flawed and is, it would seem, forever changed in his attitude to people. 

He's come to luve the Houyhnhnms, their society, and their way of living. He writes, "I had not been a Year in this Country, before I contracted such a Love and Veneration for the Inhabitants, that I entered on a firm resolution never to return to human Kind, but to pass the rest of my Life among these admirable Houyhnhnms in the Contemplation and practice of every Virtue." Gulliver decides that humans are inherently flawed and is, it would seem, forever changed in his attitude to people.