Outside of the Church there is no “Divine Gospel,” but only human substitutes. The true meaning of Scripture, the sensus Scripturae [sense of Scripture], that is, the Divine message, can be detected only juxta fidei veritatem [in conjunction with the truth of faith], under the guidance of the rule of faith.
The veritas fidei [the truth of faith] is, in this context, the Trinitarian confession of faith. It is the same approach as in St. Basil. Again, St. Jerome is speaking here primarily of the proclamation of the Word in the Church: audientibus utilis est [to those who hear the Word].