 Consisting of four books, each subdivided into chapters, the Sentences follows the distinction that Saint Augustine had drawn in the De doctrina Christiana between the things that are real and the signs that lead us back to the former. Book one treats of God, who is really real, and his triune nature. Book two deals with creation and the fall, including human nature, treating these as signs that point back to God. Book three treats of Christ, who is the antidote to the fall, and who, as God incarnate, is both thing and sign. Finally, book four treats of the sacraments, which are signs that assist the fallen in their return to God: the ultimate reality. Since book two deals with human moral psychology in the context of creation and the fall, it is here, in distinction 39, that Peter Lombard’s mention of Jerome’s commentary on Ezekiel is found.