Bonaventure Commentary on the Sentences [of Peter Lombard]: Prologue

[Arguments Pro] a. It seems that God is the subject. The subject of a science is that about which and about whose properties the science as a whole is; but this whole book is about God and his works, namely, creation and restoration, therefore etc. b. Also, it seems that the subject of this book is things and signs. For that is the subject of a science, whose division this science follows, for sciences are subdivided according to their subject matter; but this is [in the present case] thing and sign, as has been shown; therefore, etc. c. Also, it seems that the subject of this book is matters that pertain to belief. For that is the subject of a book, around which the intention and argument of the author are centered—which in this case is matters pertaining to belief. Whence the Master10 says in the Prologue that his goal is “to strengthen our faith with the shields of the tower of David,” that is, to adduce rational arguments to prove articles of faith: not faith as a habit, but faith as something that has been believed; therefore, etc.