"Birth" is the spiritual formation of Man by the knowledge and realization of the Will of God revealed to him in His Covenants, Commandments.

"Birth" is also the rebirth in the carnal Man of the spiritual Man by the union of Man's will with the Will of God by its incarnation in his life. 

 "Birth" of Jesus Christ is the spiritual formation, maturation, growth of Jesus Christ, Who, having recognized and embodied the fullness of the Wisdom of God's Will, having been made perfect, was "Born" as "Christ", the Messiah, who opened to the nations the Way of Salvation from sin.