His breakthrough came with Sartor Resartus (1833–1834), a philosophical novel exploring spiritual rebirth and social criticism through the fictional German professor Diogenes Teufelsdröckh. His masterpiece, The French Revolution: A History (1837), is renowned for its dramatic, poetic style and reportedly served as a major source for Charles Dickens's A Tale of Two Cities.
Other significant works include On Heroes, Hero-Worship, and the Heroic in History (1841), which articulated his famous "Great Man" theory of history, and Past and Present (1843), a critique of industrial society. His monumental biography, History of Frederick the Great, was published between 1858 and 1865.
Carlyle's dense, idiosyncratic prose style—often called "Carlylese"—and his moral seriousness profoundly influenced contemporaries such as Emerson and Dickens, securing his lasting place in English literature.