 Responses to the Blasphemer (Teshuvot la-Meharef): this book survived both in the original  Hebrew[7]  and in a Castilian  translation.[8]  This book is a response to the different letters that Abner’s only known student, Rabbi Isaac Pulgar, wrote against his determinist and Christian  writings.[9]  Abner did not divide this book into formal sections, though the book contains four main subjects presented in a contiguous fashion: (1) an introduction wherein Abner attacks his former pupil on his philosophical position and other personal matters between the two; (2) the Trinity and how it can be based on philosophy, scripture and quotes from the Jewish rabbinic literature; (3) the necessary existence of the incarnation of divinity in the world; and (4) a proof of the aforementioned Christian beliefs derived from scripture and other Jewish sources (Talmud and Midrashim). In this last part, which takes up almost half the book, Abner argues that the messiah had already come and that Christianity is true.