Touching as to how it stood with baptism at the time of Jerome, I find, in substance, this annotation, Bapt. Hist., page 335: “It is certain, that in the time of Jerome adults were still baptized in the occidental churches, as may be seen in his epistle against the errors of John of Jerusalem.”
He, in Epist. ad Pammach, and Ambrose, in Epistle 83, testify that those who desired baptism were called fellow-desirers.
H. Montanus writes thus: “Jerome, who also lived about that time, and, as some say, was an elder at Rome, or, much earlier, as others suppose, at Jerusalem, also testifies that in his time it was a prevailing custom, to baptize adults who had been brought up in the Christian faith, when they desired baptism, for which reason they were called Competentes, as Jerome states in his letter to Pammachius.” H. Montan. Nietigh., pages 74, 75.
Having now shown how it stood with baptism at the time of Jerome, and that the same was administered in the occidental churches to adults, we shall proceed to Jerome’s individual views and what he has written on this subject, according to ancient writers.
In Bapt. Hist., page 373, Jerome writes to Pammachius: “It is customary with us, publicly to instruct for forty days, those who are to be baptized, and enjoin them to pray to the Holy Trinity.”
D. Vicecomes finally shows, page 375, chap. 41 and 44, that Jerome wrote, that in his time they gave those who were baptized, milk and honey to eat, which, the annotator remarks, is no food for new-born infants. Moreover, he shows what is required for true baptism; namely, regeneration, consisting in the mortifying of the old, and resurrection of the new man. This he expresses in the following two passages:
Jerome further writes, page 323, lib. 12, Comment. in Ezechiel.: “We need not only the first birth, but also the second, in order that we, who are born in the flesh, may be born again after the Spirit.”
Again, page 328, Apol. Contr. Ruffin.: “We say that the old man entirely dies in baptism, and that the new man is raised with Christ in baptism; that the earthly perishes, and the heavenly is born.”
Then he admonishes the candidates for baptism, how they should conduct themselves before and at baptism; as well as how those who had already been baptized before many witnesses, and had made a good confession, ought to manifest themselves.
Again, page 374, Epist. 83, ad Ocean, he writes: “The catechumens who are learning the Christian faith must observe not to have carnal intercourse with women before baptism.”