The term ‘Assumption’ bifurcates sharply within the depth-psychology corpus, operating along two distinct but occasionally intersecting axes. The first, and most theologically charged, is the Assumption of the Virgin Mary — the bodily ascent of Mary into heaven, dogmatized by Pope Pius XII in 1950. For Jung and his commentators, principally Edinger, this event is not merely doctrinal but psychologically momentous: it is read as the collective unconscious registering the coniunctio archetype, the sacred marriage of opposites, the feminine principle ascending to co-equal status with the masculine God-image. Jung famously declared it ‘the most important religious event since the Reformation,’ a judgment Edinger returns to repeatedly as evidence of synchronicity between papal proclamation and analytical psychology’s discovery of the coniunctio. The second axis concerns epistemological and group-psychological ‘assumptions’ — the unexamined presuppositions governing scientific inquiry (McGilchrist), the proto-mental ‘basic assumptions’ that covertly organize group behavior according to Bion’s foundational theory, and the tacit assumptions undergirding coping processes (Pargament). These usages are not incidental: in each case, ‘assumption’ designates something operative beneath conscious articulation — a conviction taken for granted that nonetheless shapes all subsequent thought or behavior. The Bionian basic assumption — dependency, fight-flight, pairing — has proven especially generative, anchoring an entire tradition of group-analytic interpretation.