No angel, no messenger or lesser state, is ever told this day I have begotten you. That word is spoken only to the son, and the son is what awakens inside a person when the awareness of being knows itself as the source of all. Father is the final name that awareness answers to, the name God gives last, once a person has passed through every earlier idea of what God is.
The begetting is not something that happened once to another man long ago. It is the inner revealing each person comes to, when he is claimed as son and knows the one claiming him is his own I am. The relation runs both ways in a single self: the awareness fathers the awakened one, and the awakened one is that same awareness knowing itself. A person meets God only as father to his own son.