This first volume of the Letters of Peter Damian contains the first 30 letters, and covers the period before 1049. Here we see Peter Damian as an untiring preacher and uncompromising reformer, both of the monastic world and of the church at large. He attacks clerical laxity and monastic decadence in letter after letter. The first letter in the collection is of particular interest, containing a theological consideration of the Christian position against the Jews. Other important letters in this first volume are Damian’s allegorical interpretation of the Divine Office, his letters on the Last Days and the Judgment, on canonical and legal points (such as the prohibited degrees of consanguinity in marriage), and on liturgical matters, particularly in monastic observance.