The Devil occupies a contested and generative position within depth-psychological discourse — neither a mere theological curiosity nor a reducible moral abstraction, but a living symbol of the psyche’s own oppositional energies. Jung situated the Devil as the shadow complement of Christ, the missing fourth of an otherwise trinitarian wholeness, and crucially rejected the privatio boni formula that would diminish evil to an absence of good. In this framework, the Devil names the autonomous, archetypal force of destruction and deception that operates from within the unconscious rather than from without. Von Franz elaborated this in fairy-tale analysis, reading the Devil as a figure of irreducible archetypal evil whose feminine counterpart — the Devil’s daughter — paradoxically carries Eros and the possibility of redemption. Schoen extended the analysis into addiction, where the Devil becomes the most precise symbolic fit for the demonically compulsive, enslaving logic of alcoholism. Tarot commentators — Nichols, Pollack, Hamaker-Zondag, Jodorowsky, Place — read the Trump XV as an image of the bound shadow, material entrapment, and the confrontation with unconscious drives demanding integration. The Red Book introduces the Devil as ‘my devil’ — the adversarial standpoint within the self that must be engaged, not exorcized. Across all these registers, the Devil functions as a symbol of necessary encounter: with evil, with the shadow, with the self’s own unlived and denied dimensions.