initiated by Romans reflection outside of commentaries. For example, as we will see, Thomas Aquinas penned an extensive commentary on the entire Pauline corpus from Romans through Hebrews in which he emphasized Paul’s teaching on grace. The intense reflection occasioned by these commentaries influenced his work elsewhere on grace itself in the second part of the Summa theologiae and on Christ and the sacraments as the sources of grace in the Summa’s third part. Thus study of commentaries on their