This book is a compilation of works addressing the Unitarianism in Transylvania during the tumultuous period under Ceausescu’s regime. Sourced predominantly from previously published Hungarian materials to ensure safety for Prof. John Erdo, the writer, this collection sheds light on the survival of Transylvanian Unitarianism amidst intense state-led persecution. These writings offer a unique blend of church history and theology. The historical section, penned under strict state censorship, provides a nuanced “in-house” account of the Transylvanian Unitarian Church’s journey. In contrast, the theological segment revisits foundational Unitarian topics, exemplifying the church’s enduring spirit even in oppressive circumstances. Notably, Prof. Erdo’s essays, crafted during challenging times, articulate the faith’s core tenets, reflecting a deep-seated commitment to the oneness of God and the interconnectedness of life. This compilation serves as both an archival document and a testament to the resilience of belief during times of persecution.