The Hermetic Marriage is an authoritative and enlightening enquiry into a vital tenet of Hermetic Philosophy: the ever-present principle of Duality in the universe, and its importance both to alchemy and individual spiritual development. In human existence this principle manifests as sex, and more importantly, as the masculine and feminine attributes within each individual personality. Spiritual progress, in the symbolic language of Alchemy, requires a perfect 'Marriage' of these two opposite poles, and their integration into a single enlightened being. Manly P. Hall uses philosophy, fable, and fairy tales to explain the mystical language of this Hermetic Union, which each of us must undergo to achieve the perfect spiritual fusion of our male and female aspects. Once achieved, the door is then open to further spiritual progress.