The Firstborn, Who was begotten according to His nature, underwent yet another birth outside His nature, so that we too would understand that after our natural birth, we must undergo another (birth) outside our nature. As a spiritual being, He was unable to become physical until the time of physical birth. And so too physical beings, unless they undergo another birth, cannot become spiritual. The Son, Whose birth is beyond investigation, underwent another birth which can be investigated. So, by the one we learn that His majesty is limitless, and by the other we realize that His goodness is boundless. For His majesty increases without bounds, Whose first birth cannot be imagined by any mind, and His goodness overflows without limit, Whose other birth is proclaimed by every mouth. - St. Ephrem the Syrian, "Homily on Our Lord"