Psychic life stands at the conceptual heart of depth psychology, yet its boundaries, substance, and ontological status remain among the most contested questions in the corpus. Jung insists that psychic existence is ‘the only category of existence of which we have immediate knowledge,’ making the psyche not merely one domain among others but the very medium through which any reality becomes accessible. Against reductive physiologists who treat mind as a by-product of cortical chemistry, Jung argues for the psyche as an autonomous reality whose processes — including the unconscious — cannot be dissolved into physical or biochemical explanation. Von Franz extends this claim by framing psychic life as an energic process governed by laws analogous to, yet distinct from, physical thermodynamics, while refusing Freud’s reduction of libido to sexuality. Hillman, departing from classical Jungian monotheism, insists that psychic life is irreducibly polytheistic in character, resisting all systematic unity. Aurobindo introduces a vertical cosmology in which psychic life comprises multiple sheaths — surface mental, subliminal vital, and psychic proper — each with its own range and truth. Across all these positions, the shared stakes are identical: whether psychic life is derivative or primary, bounded or infinite, and whether it survives the dissolution of the body that temporarily houses it.