Peter Abelard (1079-1142) is widely recognized as one of the most important writers of the twelfth century, famed for his skill in logic as well as his romance with Heloise. Even among Abelard's writings, the Collationes - or Dialogue between a Christian, a Philosopher, and a Jew - are remarkable for their daring and intellectual imaginativeness. Written probably c.1130, the work contains the fullest exposition of many aspects of abelard's ethics, the only statement of his unusual eschatological theory, and some of his most interesting ideas about faith and the relationship between theism and revealed religion This is the first full critical edition of the Collationes. Based on an entirely new collation of the manuscripts, it provides a facing-page English translation, detailed notes, and an extensive historical and philosophical introduction.