And Jacob begat Joseph the husband of Mary, of whom was born Jesus, who is called Christ.
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Augustine of Hippo
Since he thus related that Christ was born from Mary as a virgin and not as a result of intercourse with Joseph, for what reason does Matthew call him his father, if not because we understand Joseph to be truly the husband of Mary, not through intercourse of the flesh but in virtue of the genuine spiritual union of marriage? … All this suggests that Luke’s phrase, “as was supposed,” was inserted with a view of correcting those of the opinion that he was born from Joseph in the same way that others are born. .