In this chapter, Swift satirizes the theory that "experience is the best teacher." Already he has attacked all the other methods of gaining knowledge: Abstract reason was ridiculed in Laputa; pragmatic and scientific knowledge was his target in Balnibarbi; the humanities, and particularly history, suffered in Luggnagg. Now he discredits accumulated experience.
Like most people, Gulliver assumes that experience brings both wisdom and morality. He voices the human dream of immortality, sure that immortality will confer immense experience and, therefore, immense wisdom. Swift counters this naive dream of Gulliver's by presenting the Struldbruggs. It is true that they have immortality, but they do grow old. They wrinkle — and they degenerate; the physical is a symbol of the abstract once more. These creatures lack hope, kindness, generosity, affection, simplicity, honesty, and innocence.
When Swift's readers finish this chapter, they realize that Swift's theory is that reason is never to be exalted. People simply cannot depend on abstract, impersonal, inhuman reason. Nor can they depend on technological innovation, on history, or on the "modern" humane studies. The best guides are poetry and ancient philosophy.
