Thomas Hobbes · Politics
Hobbes’s radical foundation: that everything - bodies, thoughts, desires, the state itself - is just matter in motion, to be studied with the rigour of geometry.
Hobbes was dazzled by geometry - by how, from a few clear definitions and axioms, Euclid could prove vast, certain truths that no one could deny. He dreamed of doing the same for politics: starting from precise definitions of human nature and reasoning, step by step, to unshakable conclusions about how we must be governed. The whole of Leviathan is built this way, beginning not with kings or laws but with the most basic question of all - what a human being fundamentally is.
From this materialism Hobbes draws a startling account of value. If desire is just internal motion toward a thing, then ‘good’ is simply whatever a person desires, and ‘evil’ whatever they shun - there are no good or evil things in themselves, only objects of appetite and aversion. Will, likewise, is not some free faculty but merely ‘the last appetite in deliberating,’ the desire that happens to win out and trigger action. Even the loftiest human pursuits reduce, on this view, to the mechanics of wanting and fearing.
Hobbes pushes his materialism to a startling and prophetic conclusion about reason itself. If thinking is just the motion of particles in the brain, then reasoning is a mechanical process - and Hobbes describes it, astonishingly, as a kind of calculation. ‘When a man reasoneth,’ he writes, ‘he does nothing else but conceive a sum total, from addition of parcels’ - reasoning is ‘nothing but reckoning,’ adding and subtracting. We reason by manipulating names (words) according to rules, combining and separating them as an arithmetician adds and subtracts numbers. Truth and falsehood, on this view, are not features of the world but properties of speech - of how we join names in propositions; ‘true’ and ‘false’ are attributes of language, not of things, and where there is no speech, there is neither truth nor falsehood.
This has two remarkable consequences. First, it makes Hobbes one of the great ancestors of the idea that thought could be mechanised - that reasoning is computation, the rule-governed manipulation of symbols. Three centuries before the computer, he glimpsed that if reason is reckoning, then in principle a machine that could reckon could reason; the line from Hobbes runs to Leibniz’s dream of a calculus of thought, to Boole, and ultimately to artificial intelligence. Second, it makes Hobbes acutely aware of the danger of meaningless words. If reasoning is calculating with names, then using words that stand for nothing - ‘insignificant speech’ - is like trying to do arithmetic with nonsense symbols; it produces not error merely but absurdity. Hobbes blamed much of the confusion and conflict of his age on exactly this: empty scholastic jargon and undefined terms, with which people argued endlessly while meaning nothing. Define your terms precisely, reason with them as carefully as a geometer, and much human folly dissolves. The mechanisation of thought and the demand for clear definition are two faces of the same materialist conviction: that the mind is a calculating engine, and a well-run one calculates with clear and meaningful names.
This is the opening of the lesson. The rest — the dialogue, the primary source, and the recall — is in the app.
You learned that Hobbes tried to build politics on a mechanical science of human nature. Explain how he reduces thought and desire to motion, and what that buys his political theory, in your own words.
Leads to Benedict de Spinoza.
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