“It was as if the angel were saying to Joseph, ‘Do not  imagine that, because he is conceived of the Holy Spirit, that you have no part in the ministry of this new dispensation. In the conception you had no part. You never touched the virgin. Nevertheless I am giving you what pertains to a father…For though the offspring is not your own, yet you are called to exhibit a father’s care toward him’.”
(St John Chrysostom, Homily on Matthew)