Themes are the fundamental and often universal ideas explored in a literary work.
Gulliver’s Travels implicitly poses the question of whether physical power or moral righteousness should be the governing factor in social life. Gulliver experiences the advantages of physical might both as one who has it, as a giant in Lilliput where he can defeat the Blefuscudian navy by virtue of his immense size, and as one who does not have it, as a miniature visitor to Brobdingnag where he is harassed by the hugeness of everything from insects to household pets. His first encounter with another society is one of entrapment, when he is physically tied down by the Lilliputians; later, in Brobdingnag, he is enslaved by a farmer. He also observes physical force used against others, as with the Houyhnhnms’ chaining up of the Yahoos.
But alongside the use of physical force, there are also many claims to power based on moral correctness. The whole point of the egg controversy that has set Lilliput against Blefuscu is not merely a cultural difference but, instead, a religious and moral issue related to the proper interpretation of a passage in their holy book. This difference of opinion seems to justify, in their eyes at least, the warfare it has sparked. Similarly, the use of physical force against the Yahoos is justified for the Houyhnhnms by their sense of moral superiority: they are cleaner, better behaved, and more rational. But overall, the novel tends to show that claims to rule on the basis of moral righteousness are often just as arbitrary as, and sometimes simply disguises for, simple physical subjugation. The Laputans keep the lower land of Balnibarbi in check through force because they believe themselves to be more rational, even though we might see them as absurd and unpleasant. Similarly, the ruling elite of Balnibarbi believes itself to be in the right in driving Lord Munodi from power, although we perceive that Munodi is the rational party. Claims to moral superiority are, in the end, as hard to justify as the random use of physical force to dominate others.
Like many narratives about voyages to nonexistent lands, Gulliver’s Travels explores the idea of utopia—an imaginary model of the ideal community. The idea of a utopia is an ancient one, going back at least as far as the description in Plato’s Republic of a city-state governed by the wise and expressed most famously in English by Thomas More’s Utopia. Swift nods to both works in his own narrative, though his attitude toward utopia is much more skeptical, and one of the main aspects he points out about famous historical utopias is the tendency to privilege the collective group over the individual. The children of Plato’s Republic are raised communally, with no knowledge of their biological parents, in the understanding that this system enhances social fairness. Swift has the Lilliputians similarly raise their offspring collectively, but its results are not exactly utopian, since Lilliput is torn by conspiracies, jealousies, and backstabbing.
The Houyhnhnms also practice strict family planning, dictating that the parents of two females should exchange a child with a family of two males, so that the male-to-female ratio is perfectly maintained. Indeed, they come closer to the utopian ideal than the Lilliputians in their wisdom and rational simplicity. But there is something unsettling about the Houyhnhnms’ indistinct personalities and about how they are the only social group that Gulliver encounters who do not have proper names. Despite minor physical differences, they are all so good and rational that they are more or less interchangeable, without individual identities. In their absolute fusion with their society and lack of individuality, they are in a sense the exact opposite of Gulliver, who has hardly any sense of belonging to his native society and exists only as an individual eternally wandering the seas. Gulliver’s intense grief when forced to leave the Houyhnhnms may have something to do with his longing for union with a community in which he can lose his human identity. In any case, such a union is impossible for him, since he is not a horse, and all the other societies he visits make him feel alienated as well.
Gulliver’s Travels could in fact be described as one of the first novels of modern alienation, focusing on an individual’s repeated failures to integrate into societies to which he does not belong. England itself is not much of a homeland for Gulliver, and, with his surgeon’s business unprofitable and his father’s estate insufficient to support him, he may be right to feel alienated from it. He never speaks fondly or nostalgically about England, and every time he returns home, he is quick to leave again. Gulliver never complains explicitly about feeling lonely, but the embittered and antisocial misanthrope we see at the end of the novel is clearly a profoundly isolated individual. Thus, if Swift’s satire mocks the excesses of communal life, it may also mock the excesses of individualism in its portrait of a miserable and lonely Gulliver talking to his horses at home in England.
The idea that humans are not meant to know everything and that all understanding has a natural limit is important in Gulliver’s Travels. Swift singles out theoretical knowledge in particular for attack: his portrait of the disagreeable and self-centered Laputans, who show blatant contempt for those who are not sunk in private theorizing, is a clear satire against those who pride themselves on knowledge above all else. Practical knowledge is also satirized when it does not produce results, as in the academy of Balnibarbi, where the experiments for extracting sunbeams from cucumbers amount to nothing. Swift insists that there is a realm of understanding into which humans are simply not supposed to venture. Thus his depictions of rational societies, like Brobdingnag and Houyhnhnmland, emphasize not these people’s knowledge or understanding of abstract ideas but their ability to live their lives in a wise and steady way.