This final chapter synthesizes the research findings by integrating theological insights from both Catholic and Shīʿī traditions through the experiential lens of the Wings of Unity project. It proposes a hermeneutic of ‘eschatological unity’ as a future hope, a present interpretive key, and a lived foreshadowing (prolepsis) of ultimate reconciliation. This framework blends mystical and practical dimensions to support interfaith collaboration. Anchored in the contributions of Piero Coda and Muḥammad ‘Alī Shomālī—whose mutual commitment has shaped Wings of Unity—the chapter explores how lived dialogue informs theology and, in turn, how theology can shape ethical and spiritual action. Emphasis is placed on the role of the Spirit of God and human consciousness in forming hope and responsibility. Three dimensions structure the synthesis: ontology (unity in and through the One God), eschatology (God’s unifying will), and ethics (interpersonal and interreligious love). Drawing from Catholic Magisterial teaching, Shī‘ī doctrines, and mystical experiences such as Chiara Lubich’s Focolare spirituality, the chapter reflects on a ‘fusion of horizons’ that might jointly articulate theological discourse. It redefines religious pluralism in non-relativistic terms—grounded in mutual esteem and divine orientation, not theological compromise—and critiques both inclusivism and comparative theology. The mystical-dialogical method it proposes allows faith communities to discover new dimensions of truth through mutual witness. Ultimately, eschatological unity emerges as a shared gift in the making, made tangible through loving collaboration. God’s ultimate unity (tawḥīd) is both path and destination: Catholics and Shī‘ī Muslims are called to journey toward God together.