The Commentary on the Sentences dates from St. Thomasâ€™s first teaching years in Paris, where he began teaching around the year 1252. As a new teacher, St. Thomas was expected to prepare lectures based on the Sentences of Peter Lombard, thus demonstrating his knowledge of and insight into both theology and philosophy. In the Sentences, St. Thomas was presented with a general theology text which draws upon the writings of the Church Fathers. This was a significant opportunity for St. Thomas to delve into the beauty of theology.
Although this text is a commentary on the Sentences, it also contains much original theological thought of St. Thomas himself as he departs at times from the text that he is commenting on to explore other facets of the teaching set forth by Peter Lombard. As this work comes from the earlier years of St. Thomasâ€™s career, it is evident that it represents St. Thomasâ€™s seminal theological thought that is later developed and sharpened in the Summa Theologiae and the Summa Contra Gentiles.