The Book of Supreme Truth
The Book of the Highest Truth stands as one of Jan van Ruysbroeck's most philosophically rigorous mystical treatises, written during his mature period at the Augustinian monastery of Groenendaal outside Brussels. Composed in Middle Dutch for a learned audience, this work emerged from Ruysbroeck's ongoing concern to articulate the highest reaches of mystical experience while maintaining orthodox theological boundaries. The treatise represents his attempt to describe the soul's ultimate union with God in terms that could satisfy both experiential mystics and scholastic theologians.
Ruysbroeck structures his argument around the progressive stages by which the soul ascends to what he calls the "highest truth" of divine union. He distinguishes carefully between the active life of virtue, the interior life of devotion, and the contemplative life of mystical union, showing how each prepares for the next. The work's central insight concerns the paradox of mystical unity: the soul achieves its highest fulfillment not by losing its individual identity in God, but by discovering its eternal ground in the divine essence while remaining a created being. Ruysbroeck employs the technical vocabulary of scholastic theology alongside vivid metaphors drawn from nature and human relationships to describe states of consciousness that he insists transcend ordinary conceptual understanding. His treatment of the relationship between essence and persons in the Trinity provides the theological foundation for his psychology of mystical experience.
The Book of the Highest Truth influenced subsequent Flemish and German mysticism, particularly through the circulation of Latin translations in monastic libraries. Modern scholars recognize it as Ruysbroeck's most systematic theological statement and a crucial bridge between the speculative mysticism of Meister Eckhart and later developments in Catholic mystical theology. Who should read this: serious students of medieval mysticism and systematic theology who can engage with abstract metaphysical discussions; those seeking philosophical precision in mystical writing rather than devotional warmth will find Ruysbroeck's careful distinctions rewarding.