Breakthrough occupies a contested and multivalent position across the depth-psychology corpus. At its most elemental, the term names a rupture in established structures through which something new and previously contained irrupts into consciousness or history. Jung’s citation of Meister Eckhart’s ‘breaking through’ formulation in Psychological Types elevates breakthrough to a mystical-ontological category: the soul’s return through God into the depths of the Godhead, a movement held to surpass even the original emanation. Edinger extends this into analytical psychology proper, reading the encounters of Faust and Zarathustra as ‘a breakthrough of total experience’ — the Greater Personality breaking into the modern psyche. In I Ching commentary (Wang Bi, Anthony), breakthrough is structurally codified as the hexagram Kuai (Resolution): the decisive moment when accumulated increase can no longer be contained. Tarnas situates the term cosmologically, correlating Jupiter-Uranus alignments with ‘condensed waves of celebrated milestones’ — creative and emancipatory breakthroughs appearing in synchronous clusters across history. Schoeller’s neuroscientific research bridges the phenomenological and somatic, correlating ‘emotional breakthrough’ with aesthetic chills, psychedelic states, and measurable shifts in psychological insight. Yalom’s clinical voice introduces the therapeutic register, noting that therapists ‘in search of a breakthrough’ have reached for Gestalt, bioenergetic, and encounter techniques to dynamite affective blockade. The central tension across all these registers is whether breakthrough is an irruption granted by the unconscious, the cosmos, or a structural inevitability produced by accumulation — and what its psychological cost and integration demand.