Luke 1:34 - Matthew Poole's English Annotations on the Holy Bible

There are some would excuse Mary in this reply, and tell us these words spake in her no doubt that the things spoken by the angel should not come to pass, only admiration, or a desire to be further acquainted which way God would effect such a wonder of providence. Others think her words hardly excusable from all guilt, though the more excusable because there had yet been no such precedent made in the world of the Divine power, as to cause a virgin to conceive, and bring forth a son. The next words, seeing I know not a man, seem to import that she understood the angel of the present or past time, that she had already conceived, or should immediately conceive, against which she objects her not having any carnal knowledge of any man. For the notion of some papists, that would from hence impose upon us to believe that Mary hath vowed virginity, as if the sense of the words were, I am resolved never to know man, it is so ridiculous, that no man of ordinary sense can allow it; for, besides that there were no such vows that we ever read of amongst the Israelites, nor could any such be made but by the law of God might be rescinded, if made when the virgin was in her father's house; and besides that it is very improbable that a Jewish woman should make such a vow, in whom barrenness was such a reproach, and who looked upon it as a curse; I say, besides these things, who can have such unworthy thoughts of the blessed virgin, as to think that she should, having made such a vow, admit of an espousal to Joseph to mock him? But she certainly understood the angel as speaking of a thing in being, or which presently should be; and though she believed what the angel said, yet is desirous of further satisfaction how such a thing could be out of the ordinary course of nature.