The term ‘Vital Force’ occupies a richly contested position across the depth-psychology corpus, functioning simultaneously as a cosmological principle, a psychological energy substrate, and a threshold concept between matter and spirit. Sri Aurobindo furnishes the most systematic treatment, identifying the life-force (prana, the pranic shakti) as an intermediary dynamism between gross Matter and Mind — not a discrete entity but a mode of the one World-Force whose full nature is only disclosed through supramental transformation. In this framework, the vital force carries the impress of desire, possession, and self-affirmation, and its purification is essential to any integral yoga. The Tibetan tradition, as rendered by Evans-Wentz, assigns the vital force a precise physiological-subtle role at the moment of death, its trajectory through the nerve-channels determining entry into Bardo states. John of Damascus represents the scholastic-Aristotelian strand, distinguishing the ‘vital faculty’ (pulsation) as an involuntary, vegetative power beneath rational governance. Daoist sources, via Kohn, treat vital force as a cultivable reservoir whose conservation — against depletion through sexuality — is prerequisite for spiritual refinement. Easwaran’s Upanishadic readings equate the vital force with prana as a quantifiable ‘adaptation energy.’ What unites these otherwise divergent traditions is the axiom that vital force is real, operative, and hierarchically positioned between body and higher consciousness — a necessary medium that must be known, mastered, or transmuted rather than simply denied.