Significance of the number 4 in alchemy

The number four is not merely a count in alchemical thought — it is an organizing principle, the minimal structure through which wholeness becomes thinkable. Jung states this with characteristic directness:

"The quaternity is an archetype of almost universal occurrence. It forms the logical basis for any whole judgment. If one wishes to pass such a judgment, it must have this fourfold aspect… The ideal of completeness is the circle or sphere, but its natural minimal division is a quaternity."

This is the load-bearing claim: four is not a preference but a structural necessity. Any representation of totality — cosmic, psychological, or material — tends spontaneously toward fourfold articulation. The alchemists inherited this intuition from deep antiquity. The Egyptian quaternity of Horus's four sons, the four faces of Ezekiel's cherubim, the four quarters of heaven, the four elements of Greek natural philosophy — all express the same archetypal pressure. In alchemy, the tetrasomia (the four metals: lead, tin, iron, copper, corresponding to Saturn, Jupiter, Mars, and Venus) names the specific quaternary substrate the opus works upon. The goal of the tetrasomia is, as Jung puts it in Alchemical Studies, "the reduction (or synthesis) of a quaternio of opposites to unity" — two dyads, one benevolent, one malefic, held in tension until their union produces the lapis.

The four elements — fire, air, water, earth — supply the tinctorial and operational grammar of the work. Transformation proceeds through all four; the opus is divided into four parts (tetrameria), and Mercurius himself, the arcane substance, is described as quadratus — fourfold, appearing in the four corners of heaven with four distinct animal forms. The fourfold structure is not decorative but constitutive: the lapis philosophorum is synthesized from the quaternity of elements, and the coniunctio tetraptiva — the fourfold union — is called the noblest conjunction precisely because it produces the stone by uniting all four.

Yet the tradition never lets four rest comfortably. The famous Axiom of Maria Prophetissa — "One becomes two, two becomes three, and out of the third comes the One as the fourth" — encodes the tension between three and four that runs through the entire alchemical literature. Von Franz, drawing on Jung, identifies this wavering as structurally significant:

"In alchemy there are three as well as four regimina or procedures, three as well as four colours. There are always four elements, but often three of them are grouped together, with the fourth in a special position — sometimes earth, sometimes fire… Four signifies the feminine, motherly, physical; three the masculine, fatherly, spiritual. Thus the uncertainty as to three or four amounts to a wavering between the spiritual and the physical."

This wavering is not a defect in alchemical thinking but its most honest moment. The fourth — typically earth, the most material and least spiritualized element — is the one that resists absorption into the Trinity. It is the inferior term, the one that keeps the work anchored in matter rather than allowing it to sublimate into pure spirit. Edinger maps this precisely: the quaternity symbolizes the goal of individuation, the completed state, while the trinity symbolizes the process — the dynamic, developmental rhythm of thesis, antithesis, synthesis. Four is structural wholeness; three is temporal becoming. The alchemical opus requires both, which is why the Axiom of Maria moves through three steps to arrive at a fourfold result.

Hillman pushes this further, and here he parts company with Jung. For Jung, fourness was "like an article of faith condensed into a numerical or geometric symbol," the Self's native geometry. Hillman argues that Jung's reduction of the alchemical color sequence from four to three — dropping yellow, the xanthosis — betrays the very quaternity Jung championed. Yellow, Hillman contends, carries the earthly, stasis-prone, even "devilish" materiality that the quaternity requires. Its omission allows the opus to be absorbed into "ascensionist, progressivist, and redemptive fantasies" — the pneumatic current dressed in alchemical clothing. Restoring yellow, for Hillman, means refusing the upward arc and staying with the soul's actual conditions: neither ascending nor descending, but remaining with the image in its inhibiting, earthbound specificity.

The number four in alchemy is thus simultaneously a cosmological structure (the four elements, the four quarters of heaven), an operational grammar (the fourfold division of the opus), a psychological template (the four functions, the quaternity of the Self), and a site of resistance — the fourth always the most difficult, the most material, the one that refuses to be spiritualized away.

Axiom of Maria — the alchemical formula encoding the arithmetic of transformation: one, two, three, and the fourth
Opus Alchymicum — the Great Work as individuation projected onto matter
Lapis Philosophorum — the stone produced by the fourfold synthesis, Jung's symbol of the Self
James Hillman — portrait and bibliography of the archetypal psychologist who challenged Jung's reading of alchemical color

Sources Cited

Jung, C.G., 1963, Memories, Dreams, Reflections
Jung, C.G., 1967, Alchemical Studies
Jung, C.G., 1955, Mysterium Coniunctionis
von Franz, Marie-Louise, 1966, Aurora Consurgens
Edinger, Edward F., 1972, Ego and Archetype
Hillman, James, 2010, Alchemical Psychology