Jovinianus, concerning whom we know little more than is to be found in the two following books, had published at Rome a Latin treatise containing all, or part of the opinions here controverted, viz. (1) “That a virgin is no better as such than a wife in the sight of God. (2) Abstinence is no better than a thankful partaking of food. (3) A person baptized with the Spirit as well as with water cannot sin. (4) All sins are equal. (5) There is but one grade of punishment and one of reward in the future state.” In addition to this he held the birth of our Lord to have been by a “true parturition,” and was thus at issue with the orthodoxy of the time, according to which the infant Jesus passed through the walls of the womb as His Resurrection body afterwards did out of the tomb or through the closed doors. Pammachius, Jerome's friend, brought Jovinian's book under the notice of Siricius, bishop of Rome, and it was shortly afterwards condemned in synods at that city and at Milan (about A.D. 390). He subsequently sent Jovinian's books to Jerome, who answered them in the present treatise in the year 393. Nothing more is known of Jovinian, but it has been conjectured from Jerome's remark in the treatise against Vigilantius, where Jovinian is said to have “amidst pheasants and pork rather belched out than breathed out his life,” and by a kind of transmigration to have transmitted his opinions into Vigilantius, that he had died before 409, the date of that work.
The first book is wholly on the first proposition of Jovinianus, that relating to marriage and virginity. The first three chapters are introductory. The rest may be divided into three parts:
The treatise gives a remarkable specimen of Jerome's system of interpreting Scripture, and also of the methods by which asceticism was introduced into the Church, and marriage brought into disesteem.
Source: Against Jovinianus (New Advent)