A short dialogue appended to the Laws that defines true wisdom as astronomy-grounded number-knowledge of the divine, ordered heavens.
The Epinomis is a brief continuation of the conversation among the Athenian Stranger, Clinias, and Megillus that closes Plato's Laws (and is transmitted with it, though its authorship is disputed by scholars, with some attributing it to Plato's student Philip of Opus). Clinias reminds the group that they set out to determine what a mortal must learn in order to become wise, and the Athenian takes up the question directly: what single science, if removed from human nature, would make us the most senseless of all creatures?
The Athenian works through a catalogue of candidate arts and dismisses each in turn as not truly wisdom, including farming, building, hunting, divination, medicine, seamanship, forensic rhetoric, and even native quickness of mind. He argues that number is the one thing that separates the wise from the ignorant, and traces its origin to a god (identified with Uranus/Heaven) who taught humans to count through the regular alternation of day and night and the phases of the moon. From here the dialogue moves into cosmology: soul is older than body and rules it; the visible stars and planets, moving in perfect unchanging order, are the clearest evidence of intelligence in the universe, while human beings, who move about, wrongly imagine themselves more alive than the fixed heavens. The Athenian sets out five elemental bodies (fire, air, water, earth, aether) and populates the cosmos with graded kinds of living being, from earthly animals up through daemons to the visible star-gods themselves, and names the eight orbits of sun, moon, and five planets, crediting Egyptian and Syrian observers as the first astronomers whose knowledge the Greeks inherited and refined.
The work concludes that true wisdom is a specific curriculum: arithmetic, then geometry, then solid geometry, then astronomy proper (understanding the seven circuits within the eight orbits), and finally grasping that all these mathematical studies form a single unified bond. Whoever masters this course of study should, in old age, be appointed to the highest offices and to the "nocturnal council" that oversees the state's wisdom -- a proposal that ties the dialogue's cosmology directly back to the practical politics of the Laws.
“I say it isn't possible for human beings to become blessed and happy, except for a few — I mean for as long as we're alive; but there's a fine hope of attaining, once we've died, everything for the sake of which one would be eager, while alive, to live as finely as possible”
— Epinomis · read this chapter →
“One thing above all others, one might say, would do this to the whole mortal race — the thing that gives it number. I believe it's a god, rather than any chance, who gave it to us for our preservation.”
— Epinomis · read this chapter →
“the greatest point of it was this: that soul, every soul, is older than body, every body”
— Epinomis · read this chapter →
“the true astronomer must be the wisest of men — not the one who does astronomy in Hesiod's fashion and like all such people, merely observing settings and risings, but the one who studies the seven circuits within the eight orbits”
— Epinomis · read this chapter →
“the morning star, being the same as the evening star, is reasonably identified with Aphrodite — and this fits well with a Syrian lawgiver — while the one that runs together with the sun and with this one belongs, more or less, to Hermes”
— Epinomis · read this chapter →
It is a short dialogue, presented as a sequel to Plato's Laws, in which the Athenian Stranger, Clinias, and Megillus try to identify what single kind of knowledge makes a human being truly wise. The answer they arrive at is a graded mathematical curriculum -- arithmetic, geometry, solid geometry, and astronomy -- capped by understanding the divine order of the heavens.
Its authorship has long been disputed among scholars; ancient tradition attached it to Plato's Laws as a thirteenth book, but many attribute it instead to Plato's student Philip of Opus. The text itself is written in the same dramatic setting and continues the same conversation as the end of the Laws.
The dialogue rejects craft-knowledge, farming, medicine, seamanship, rhetoric, and even natural quickness of mind as true wisdom, arguing instead that number and its highest application, astronomy, are what separate the wise from the ignorant. The truly wise person is one who has grasped 'every diagram of number, every system of harmony, and the whole agreement of the revolution of the stars' as a single unified thing.
The Athenian argues that the stars and planets move in complete, unchanging order, which he takes as clear evidence of intelligence, while human beings mistakenly think their own restless movement proves they are more alive. Because soul is older than and rules body, and only soul could account for such flawless regularity, the visible heavenly bodies are treated as ensouled and divine.
It is the governing body mentioned at the dialogue's close, to which those who have mastered the full mathematical and astronomical curriculum should be appointed in old age. The Epinomis presents this council as the practical political payoff of the cosmological argument developed throughout the dialogue.
The Athenian explains that the third of the three planets nearly equal in speed to the sun has no common name because the first person to observe it was a foreigner, and credits Egypt and Syria's clear skies with producing the earliest astronomers, whose knowledge later spread to Greece.
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