The creation of consciousness requires that new contents be carved out of the unconscious… Swords, knives, and sharp cutting edges of all kinds belong to the symbolism of separatio.
Edinger argues that cutting — as Logos-Cutter and as symbolic sharp edge — is the primary alchemical operation of separatio, the act by which consciousness differentiates itself from the unconscious.
, Anatomy of the Psyche: Alchemical Symbolism in Psychotherapy, 1985thesis