Genesis 16:10

10.I will multiply thy seed exceedingly For the purpose of mitigating the offense, and of alleviating what was severe in the precept, by some consolation, he promises a blessing in the child which she should bear. God might indeed, by his own authority, have strictly enjoined what was right; but in order that Hagar might the more cheerfully do what she knew to be her duty, he allures her, as by blandishments, to obedience. And to this point those promises tend, by which he invites us to voluntary submission. For he would not draw us by servile methods, so that we should obey his commands by constraint; and therefore he mingles mild and paternal invitations with his commands, dealing with us liberally, as with sons. That the angel here promises to do what is peculiar to God alone, involves no absurdity, for it is sufficiently usual with God to invest his ministers whom he sends with his own character, that the authority of their word may appear the greater. I do not, however, disapprove the opinion of most of the ancients; that Christ the Mediator was always present in all the oracles, and that this is the cause why the majesty of God is ascribed to angels. (390) On which subject I have already touched and shall have occasion to say more elsewhere.