Glossa Ordinaria

(ap. Anselm.) Or, he says, all this was done, meaning, the Virgin was betrothed, she was kept chaste, she was found with child, the revelation was made by the Angel, that it might be fulfilled which was spoken. For that the Virgin should conceive and should bring forth would never have been fulfilled, had she not been espoused that she should not be stoned; and had not her secret been disclosed by the Angel, and so Joseph taken her unto him, that she was not dismissed to disgrace and to perish by stoning. So had she perished before the birth, that prophecy would have been made void which says, She shall bring forth a Son. (Isa. 7:14.)