A sugar merchant's son put the word nihilism on the philosophical map
Friedrich Heinrich Jacobi trained for business, not scholarship. Yet this Düsseldorf merchant's son sparked one of German philosophy's great quarrels, accused Enlightenment reason of leading inevitably to nihilism, and argued that even the existence of the outside world must finally be taken on faith. His critics called him a Jesuit in disguise.
Born in Düsseldorf on 25 January 1743, Jacobi was the second son of a wealthy sugar dealer. After a brief apprenticeship at a Frankfurt merchant house in 1759 he was sent to Geneva, where the shy young man joined a literary and scientific circle and read Rousseau and Voltaire. Back home he married Elisabeth von Clermont and ran the family firm, but soon moved into public finance, joining the council of the duchies of Jülich and Berg in 1770. His mansion at Pempelfort became a magnet for writers, and he co-founded a literary journal with Christoph Martin Wieland.
A brief post in Munich in 1779 as a Bavarian customs minister ended when his push to loosen mercantilist tariffs met resistance; he returned home and wrote essays defending Adam Smith. The turning point came in 1780, when Gotthold Lessing told him that Spinozism was the only real philosophy. Lessing died months later, and Jacobi's letters on Spinoza with Moses Mendelssohn, published in 1785, attacked dogmatic philosophical systems and ignited the pantheism controversy. Enlightenment thinkers mocked him as a pietist and an enemy of reason.
He hit back in 1787 with a book on David Hume and belief. Its appendix probed Kant's thing-in-itself: Jacobi agreed it cannot be known directly, but said we must believe in a real object behind our ideas, a conviction given by revelation rather than proof. Schopenhauer later sneered that he wanted to open a little door for faith in general. When Fichte was accused of atheism, Jacobi's 1799 Letter to Fichte branded transcendental philosophy nihilism.
The irony is that his campaign backfired. Rather than returning to faith, later German thinkers grew fascinated by Spinoza and pantheism, and his critique pushed many toward atheism. French occupation drove him from Pempelfort in 1794 to Holstein for nearly a decade. He died on 10 March 1819, remembered for one of the earliest systematic statements of nihilism.
Source: Friedrich Heinrich Jacobi
