Origen

“ What kind of sign, then, would that have been—a young woman who was not a virgin giving birth to a child? And which of the two is the more appropriate as the mother of Immanuel (i.e., “God with us”) ,—whether a woman who has had intercourse with a man, and who has conceived after the manner of women, or one who is still a pure and holy virgin? Surely it is appropriate only to the latter to produce a being at whose birth it is said, “God with us.” ”

“ If with a foresight of the future, then the prophets were divinely inspired; if with no foresight of the future, let him explain the meaning of one who speaks thus boldly regarding the future, and who is an object of admiration among the Jews because of his prophetic powers. ”