the solution is one, yet in it there may be distinguished a first, and a second…. the second is that perfect solution of body and spirit at the same time, in which the solvent and the thing solved always abide together
Edinger demonstrates that the alchemical solutio contains an irreducible duality — a preliminary dissolution to prima materia and a higher conjunctive dissolution in which solvent and dissolved substance become inseparable, with simultaneous consolidation of spirit.
, Anatomy of the Psyche: Alchemical Symbolism in Psychotherapy, 1985thesis