A Tale of a Tub
Robert Hendrickson notes in his book "British Literary Anecdotes" that "Swift was always partial to his strikingly original "The Tale of a Tub" (1704). On reading the work again in later years, he exclaimed 'Good God! What a genius I had when I wrote that book!'"
Sweetness and light
Jonathan Swift first used the phrase in his mock-heroic prose satire, "The Battle of the Books" (1704), a defense of Classical learning (1704), which he published as a prolegomenon to his "A Tale of a Tub". It gained widespread currency in the Victorian era, when English poet and essayist Matthew Arnold picked it up as the title of the first section of his 1869 book "Culture and Anarchy: An Essay in Political and Social Criticism", where "sweetness and light" stands for beauty and intelligence, the two key components of an excellent culture.