Here if you inquire to what day the prophet looks forward, (b) you will find it to be the very time of the appearance of our Saviour. For when the prophet says: " Behold a virgin shall ,be with child, and shall bring forth a son," though he interposes many things, yet he prophesies of the things that will come to pass on that very day, that is to say about the time of our Saviour's appearance.