I believe that he was made man, joining the human nature with the divine in one person; being conceived by the singular operation of the Holy Ghost, and born of the blessed Virgin Mary, who, as well after as before she brought him forth, continued a pure and unspotted virgin.
via Written in 1749.
The letter is filled with warmth to Roman Catholics.
Taking a scholarly position, I think Mary had other children; however, it is interesting Bro. John’s belief here. How startling this might be to many modern “biblical” United Methodists.