Despite several centuries of scholarly activity, one of the most outstanding figures of the twelfth-century renaissance, Honorius Augustodunensis, remains an elusive figure. Almost nothing is known of his life--where he was born, where exactly he lived, or where he died. Yet in his own day, Honorius's considerable literary output was extremely popular, was copied in profusion, and housed in libraries across Europe. Unfortunately, most studies of Honorius's works have consisted of very general surveys that oversimplify his thought and present Honorius himself as a `simplistic' thinker. Based upon a new critical edition of the two surviving recensions of Honorius's dialogue, Inevitabile, this study seeks to redress this problem. After a careful review of the scholarly literature on the text, from 1552 to 1996, several passages from both redactions of the Ineuitabile are carefully analyzed to illustrate both the complexity of Honorius's use of his sources (auctores/auctoritates), and his masterful blending of literary allusion with dialectic, which is the foundation of his theological methodology. Finally, it is shown that the doctrine of predestination in the earliest recension of the Inevitabile, which has traditionally been labelled `Augustinian', is in fact based, in large measure, on the teachings of John Scottus Eriugena. This study seeks to change the way that Honorius's texts are read and interpreted, in the firm conviction that only by engaging with the intricacies of his sources and methodology, can his true achievement be understood and the purpose behind his vast corpus of writings be grasped.