The volume presents the proceedings of the international symposium, fruit of a common research project engaged in by 48 scholars, that took place in Rome to celebrate the 8th centennial of Saint Bonaventure's birth. The theme, "e;Deus summe cognoscibilis"e;, could sound, in the contemporary agnostic, secular context, like a provocation. The approach, however, of the symposium was to consider "e;the current theological relevance of Saint Bonaventure"e;, focusing on thinking with our author about a number of themes: theological method (philosophy, theology and mysticism); revelation (in Scripture and history); creation (in Laudato si' and evolution); Christology (the triplex Verbum and logos of the Cross); ecclesiology and Trinitarian dimensions of sacramental theology; pre-phenomenological Trinitarian theology, and our own divine filiation. An appendix contains a previously unpublished text of J. Ratzinger about Bonaventure's theological method. The volume has also two indexes (authors' names and references to the works of Bonaventure).