The Dominican theologian and cardinal, Tommaso de Vio (1469-1534), known as Cajetan after Gaeta, his birthplace, is best remembered for two things. Firstly, he is the expositor of Aquinas, whose monumental commentary on the Summa is included in the Leonine edition of Aquinas’ works. As a consequence of this canonisation, Cajetan’s commentary is either treasured or vilified, to the extent that it is judged to represent Aquinas accurately or not; meanwhile, more subtle developments, not to mention overt disagreements, tend to be overlooked. Secondly, and more widely. Cajetan is remembered as the Roman prelate who met with Martin Luther for three days in October 1518. At those meetings, characterised typically as a dialogue of the deaf, Cajetan sought to persuade Luther to withdraw a number of unorthodox theological opinions. Several years later, Cajetan was involved, albeit peripherally, with the Roman commission that drew up the formal condemnation of Luther’s teaching.
It is commonly and plausibly assumed that the rest of Cajetan’s work is to be understood in the light of his involvement with Luther, especially his commentaries on biblical texts, which he worked on from 1524 until his death in 1534. The conventional view of the biblical commentaries (found in various forms in Iserloh, Weisheipl, Parker, Janz and others), runs roughly as follows: the Reformers had appealed to scripture alone, and on the basis of scripture were challenging the papacy and Roman traditions; Cajetan, therefore, set out in his biblical commentaries to meet his adversaries on their chosen territory, and to demonstrate, with scholastic patience and rigour, that the Roman use of scripture was sound, that the Bible belonged to the Catholic Church.