The caduceus is not a symbol of medicine because it is pleasant. It is a symbol of medicine because the same substance that poisons is the only thing that can cure. Kalsched is drawing on a deep alchemical intuition here: the figure you most want expelled from the inner life — the one that feels like pure destructiveness, the daimon of your worst patterns — is not an obstacle to healing but its very vehicle. The darkest inner figure does not need to be overcome. It needs to be recognized as what it already is.

This cuts against every instinct that says: get rid of it, neutralize it, transcend it. The pneumatic logic runs precisely that direction — if I can rise above the destructive inner figure, I will not suffer. But the alchemical image refuses that arc. The antidote is already in the poison, which means extraction is not the work; proximity is. What destroys you when encountered from the wrong angle is, approached differently — more slowly, more honestly, without the agenda of escaping it — the only thing with enough force to touch what is actually wounded. This is why Mercurius is trickster: he will not let you approach him as a resource you can simply acquire and deploy. The healing is in the meeting, not in the mastery.