multiplicatio gives us a hint as to how psychotherapy may work. To some extent, the consciousness of an individual who is related to the Self seems to be contagious and tends to multiply itself in others.
Edinger translates the alchemical multiplicatio directly into a theory of therapeutic contagion, arguing that Self-related consciousness propagates itself in the analysand as tincture permeates receptive matter.
, Anatomy of the Psyche: Alchemical Symbolism in Psychotherapy, 1985thesis