The angel answered her, "The Holy Spirit will come on you, and the power of the Most High will overshadow you. Therefore also the holy one who is born from you will be called the Son of God.
      Hereupon, the angel departed from her; having completed the errand he was sent upon, he returned, to give an account of it, and receive new instructions. Converse with angels was always a transient thing, and soon over; it will be constant and permanent in the future state. It is generally supposed that just at this instant the virgin conceived, by the overshadowing power of the Holy Ghost: but, the scripture being decently silent concerning it, it doth not become us to be inquisitive, much less positive.