The goal of this collaborative commentary on Bonaventure's Breviloquium is twofold. First, it aims to make the text of the Breviloquium itself more accessible to a wider udience, including those who have had no prior introduction to the Seraphic Doctor's theology. In addition to providing substantive theological commentaries on each of the Breviloquium's seven parts, as well as the text's Prologue, essays also consider the theological and historical contexts that shaped the text with respect to both its composition and reception. Second, in so doing, this Companion to Bonaventure's short theological summa also aims to provide an introductory window into his systematic theology in a more general way, using the topics treated by the Seraphic Doctor within the Breviloquium as an entree into key aspects of his thought, such as his Trinitarian theology, Christology, and Eschatology, as well as his teachings on creation, sin, grace, and the sacraments. The project is the fruit of an ongoing conversation between a community of emerging and established Bonaventurean scholars, who hope through it to shed light upon the historical significance and enduring theological legacy of the Breviloquium.