This book represents a rediscovery of St. Bonaventure's profound insights into marriage as a sacrament of the Life and Love of the Trinity, and of the Hypostatic Union of God and humanity in the one flesh of Jesus Christ. Bonaventure's Trinitarian theology, his Christology, and his ecclesiology all unfold through a nuptial spirituality made visible and incarnate in the indissoluble union of man and woman. Sister Paula Jean has used this work of the Middle Ages, St. Bonaventure's Breviloquium, to cast new light on contemporary questions regarding the inseparability of spousal union and fruitfulness within marriage. The study is an exploration of the meaning of sacramentality in the thought of one of its great masters. It proposes the importance of knowing religious truth symbolically to complement what we know through scientific methods.