Vincent wrote his Commonitory to provide himself with a general rule to distinguish Catholic truth from heresy, committing it to writing as a reference. It is known for Vincent's famous maxim: "Moreover, in the Catholic Church itself, all possible care must be taken, that we hold that faith which has been believed everywhere, always, by all." The currently accepted idea that Vincent was a semipelagian is attributed to a 17th-century Protestant theologian, Gerardus Vossius, and developed in the 17th century by Cardinal Henry Noris. Evidence of Vincent's semipelagianism, according to Reginald Moxon, is Vincent's, "great vehemence against" the doctrines of Augustine of Hippo in Commonitory.
Semipelagianism
was a doctrine of grace advocated by monks in and around Marseilles in Southern Gaul after 428. It aimed at a compromise between the two extremes of Pelagianism and Augustinism, and was condemned as heresy at the Second Council of Orange in 529 AD after more than a century of disputes. Augustine wrote of prevenient grace, and expanded to a discussion of predestination. A number of monastic communities took exception to the latter because it seemed to nullify the value of asceticism practiced under their rules. John Cassian felt that Augustine's stress on predestination ruled out any need for human cooperation or consent. Vincent was suspected of Semipelagianism but whether he actually held that doctrine is not clear as it is not found in the Commonitorium. But it is probable that his sympathies were with those who held it. Considering that the monks of the Lérins Islands – like the general body of clergy of Southern Gaul – were Semipelagians, it is not surprising that Vincent was suspected of Semipelagianism. It is also possible that Vincent held to a position closer to the Eastern Orthodox position of today, which they claim to have been virtually universal until the time of Augustine, and which may have been interpreted as Semipelagian by Augustine's followers. Vincent upheld tradition and seemed to have objected to much of Augustine's work as "new" theology. He shared Cassian's reservations about Augustine's views on the role of grace. In the Commonitorium he listed theologians and teachers who, in his view, had made significant contributions to the defense and spreading of the Gospel; he omitted Augustine from that list. Some commentators have viewed Cassian and Vincent as "Semiaugustinian" rather than Semipelagian. It is a matter of academic debate whether Vincent is the author of the Objectiones Vincentianae, a collection of sixteen inferences allegedly deduced from Augustine's writings, which is lost and only known through Prosper of Aquitaine's rejoinder, Responsiones ad capitula objectionum Vincentianarum. It is dated close to the time of the Commonitorium and its animus is very similar to the Commonitorium sections 70 and 86, making it possible that both were written by the same author.
