Unity in the Flame of Love offers a rich and contemplative exploration of Pope Leo XIV’s papal identity through the lens of his coat of arms and motto. Grounded in the Augustinian spiritual tradition, the book illustrates how the visual and verbal symbols of his pontificate reflect a coherent theological vision centered on interior transformation, communal love, and the pursuit of divine truth. The book begins with an overview of Pope Leo XIV’s formation in the Order of Saint Augustine, highlighting how the foundational themes of Saint Augustine—restlessness of the heart, the primacy of love and interiority, and the call to unity—shaped his pastoral approach and theological outlook. His deep engagement with Augustine’s writings, particularly the Confessions and City of God , informs his emphasis on the inner journey toward God and the communal nature of Christian life. The centerpiece of the book is the symbolic interpretation of the papal coat of arms. The pierced, flaming heart resting on an open book represents the soul’s encounter with divine love, echoing Augustine’s own conversion. The arrow signifies the wounding of the heart by God’s grace, while the book represents both Scripture and theological wisdom. Together, they convey a Church called to be intellectually rigorous, spiritually aflame, and radically open to transformation. The fleur-de-lis, often associated with Mary, purity, and Trinitarian beauty, adds another layer to the Pope’s message. It connects Marian devotion with a deeper call to spiritual nobility and unity, symbolizing the harmony that flows from God’s inner life. Pope Leo XIV uses this image to emphasize the need for humility, fidelity, and spiritual beauty in the Church’s mission. The motto In Illo Uno Unum (“In the One, We Are One”) anchors the Pope’s vision in both Scripture and Augustinian theology. Rooted in John 17:21 and Augustine’s understanding of God as the source of all unity, the motto reflects a commitment to healing divisions within the Church and promoting ecumenical and interreligious dialogue. It underscores the importance of truth and charity as the pillars of ecclesial life. The book concludes with a reflection on how Pope Leo XIV’s Augustinian vision offers the Church a spiritual map for facing modern challenges. From moral relativism to the ethical implications of AI, the Pope advocates a Church that is contemplative, missionary, and united in love. His symbols are not mere decoration—they are invitations to live deeply, think truthfully, and love radically.