Ṣ adr al-Dīn Qūnawī’s ‘The Key to the Unseen’: A Guide Book to Sufi Metaphysics □ offers the first systematic articulation of Ibn ʿArabī's revolutionary teachings, presenting one of the most significant works of Islamic spirituality and a cornerstone of Sufi metaphysics through the profound synthesis of his foremost disciple, Ṣadr al-Dīn Qūnawī. Spanning the realms of mysticism, philosophy, and theology, this foundational text explores the intricate relationships between divine manifestation, cosmic hierarchy, and spiritual realization. From the systematic presentation of metaphysical principles to the practical dimensions of mystical experience, Qūnawī examines how rigorous intellectual inquiry can illuminate the deepest questions of existence while remaining rooted in lived spiritual transformation. Through his masterful synthesis, contributors to Islamic thought witness how Sufism evolved from purely experiential practice into formal scholarly discipline, establishing frameworks that would inspire generations of commentary and shape the trajectory of Islamic spirituality across diverse cultural contexts. The work also traces how mystical insight adapts to systematic articulation, illuminating the sophisticated negotiations between experiential knowledge, intellectual discourse, and spiritual authority. Despite its immense influence throughout the Muslim world, The Key to the Unseen has remained largely unknown in Western scholarship. This translation seeks to open its transformative vision to contemporary readers, serving both as an essential introduction to Qūnawī's thought and as a vital window into one of the most fertile periods in Islamic philosophy and spirituality. A foundational contribution to the study of Sufism, Islamic philosophy, and mystical traditions, this book is essential reading for scholars of Islamic studies, comparative religion, medieval philosophy, and spiritual literature. "We are grateful to Ozgur Koca for bringing one of Sadr al-Din’s masterpieces, Miftah al-Ghayb to the attention of the English-speaking world. His translation is superb, and his commentary is immensely insightful and helpful. Sadr al-Din Qunawi stands as a “meeting of the two oceans” in the history of Islamic spirituality: son-in-law to Shaykh al-Akbar, Ibn ‘Arabi, and close companion to Mawlana Rumi. It is through Qunawi that the legacy of Ibn ‘Arabi is introduced to the East. Among other gifts, the Miftah al-Ghayb demonstrates how the Ibn ‘Arabi focus on wujud (being, connected to ecstasy) becomes connected to love, leading us on a path to becoming a realized and completed human being (insan al-kamil). Here, it is God as the Real who is ultimately both the Lover and the Beloved. Highly recommended for all students of Sufism." Omid Safi , Professor of Islamic Studies (Duke University); author of Radical Love: Teachings from the Islamic Mystical Tradition. "In translating al-Qūnawī’s Miftāh al-Ghayb , Ozgur Koca has rendered an invaluable service. The detailed teachings of one of the most important metaphysical treatises of Islam are rendered with precision and care. The meticulous translation is complemented by an extensive commentary that plumbs the depths of the tradition to provide essential guidance for students of Islamic thought. This text should be required reading for anyone who wishes to understand Islamic metaphysical traditions.” Joseph Lumbard , Hamad Bin Khalifa University. The author of Aḥmad al-Ghazālī, Remembrance and the Metaphysics of Love (SUNY Press, 2016). "Prof. Koca’s translation of Qunawi’s extremely influential but difficult text is a welcome addition to the study of Islamic spirituality and metaphysics in the West―in particular the growing literature on the school of Ibn al-ʿArabī. Despite Qunawi’s reputation for being an expositor of the more “difficult” Ibn al-ʿArabī, in fact Qunawi’s writing is even more challenging in terms of its conciseness and its reliance upon and use of technical vocabulary related to the broader Islamic intellectual tradition. These terms must be rendered precisely in order for any sense to be made of the text at all. Koca’s excellent translation is explained by extensive commentary―absolutely essential for a work of this kind―which will be of enduring value both to scholars and to students." Caner K. Dagli , Professor of Religious Studies, the College of the Holy Cross. Özgür Koca is an Associate Professor of Islamic Studies and Philosophy at Bayan Islamic Graduate School. He is the author of Islam, Causality, and Freedom: From the Medieval to the Modern Era (2020) and Islam, Causality, Science: Perspectives on the Reconciliation of Islamic Tradition and Modern Science (2024).