solutio often meant the return of differentiated matter to its original undifferentiated state-that is, to prima materia. Water was thought of as the womb and solutio as a return to the womb for rebirth. In one text the old king submits to the solutio of drowning, saying, Else I God's Kingdom cannot enter in: And therefore, that I may be Borne agen, I'll Humbled be into my Mother's Breast, Dissolve to my First Matter, and there rest.
— Edward F. Edinger
The old king speaks here with a logic that is almost unbearable in its honesty: he will dissolve himself, return to undifferentiation, become nothing — because the alternative is to remain what he is. Edinger is careful to frame solutio as operation, not metaphor, a genuine psychic event in which what has been built, consolidated, enthroned, must be unmade before it can become anything new. The king does not drown accidentally. He chooses the drowning, and the reason he gives — *that I may be borne again* — is where the passage becomes most worth watching.
There is a desire running under that line. The return to the mother's breast is offered as a precondition for entering God's kingdom, but the sequence quietly reverses under pressure: the kingdom may be the rationalization, and the dissolution the actual longing. What the soul wants is not the new king on the other side; it wants the womb, the undifferentiated rest, the relief of no-longer-being-formed. The rebirth imagery carries the promise forward, makes the regression bearable to name — but the alchemy's deeper candor is that solutio undoes without guarantee. What emerges from the prima materia is not promised. The old king does not get to know. He submits anyway, and that submission is the whole of the operation.
Edward F. Edinger·Anatomy of the Psyche: Alchemical Symbolism in Psychotherapy·1985