Heinrich Cornelius Agrippa von Nettesheim (1486–1535) was a soldier, physician, lawyer and scholar. His Three Books of Occult Philosophy, printed in full in 1533, gathered the magical learning of antiquity and the Middle Ages into one system. Nearly every later Western grimoire, the Golden Dawn included, borrows from it.
The architecture
Agrippa divides reality into three worlds, nested like spheres, and assigns one book to each.
| World | Contains | Book | Magic of… |
|---|
| Elemental | Earth, Water, Air, Fire; stones, plants, animals, bodies | I — Natural Magic | Physical substances and their hidden virtues |
| Celestial | The fixed stars and seven planets | II — Celestial Magic | Number, geometry, astrology, images and seals |
| Intellectual | Angels, intelligences and the divine names | III — Ceremonial Magic | Religion, divine names and ritual |
How influence flows
Agrippa's key idea is that virtue descends. Divine power flows from the intellectual world into the stars, and from the stars into earthly things. A plant that is warm, golden and turns toward the sun carries a share of solar virtue. A magician who gathers solar things, at a solar time, using solar numbers, concentrates that virtue.
The medium of this flow is the spiritus mundi — the spirit or soul of the world — a fine, almost-material substance linking body and soul, earth and heaven. Ficino had already described how music, scent and images could draw on it.
Sympathy and antipathy
The engine of natural magic is sympathy: things that share a quality are linked and can affect each other. Its opposite, antipathy, explains why some things repel or cancel each other. Agrippa fills chapters with examples drawn from Pliny and medieval lapidaries; many are fanciful, but the method is what matters.
Ask of any object: Which element? Which planet? Which star? Which divine name? — and you have read it the way a Renaissance magician would.
The magician's ascent
Agrippa's third book insists that the operator must be purified and "dignified": learned, morally prepared and religious. Magic is not only pulling virtues down; it is the soul rising up through the worlds. Later traditions — the Golden Dawn's grades, for instance — inherit this idea of magic as initiation.
Try it
Pick three objects in your home. For each, list its element, its likely planet (see the Correspondences tool) and why. You have just done the first exercise of natural magic.