§4. He further shows the operations of God to be expressed by human illustrations; for what hands and feet and the other parts of the body with which men work are, that, in the case of God, the will alone is, in place of these. And so also arises the divergence of generation; wherefore He is called Only-begotten, because He has no community with other generation such as is observed in creation, but in that He is called the “brightness of glory,” and the “savour of ointment,” He shows the close conjunction and co-eternity of His Nature with the Father