24 This is why the new was substituted for the old, why He Who suffered was for suffering recalled to life, why each property of His, Who was above us, was interchanged with each of ours, why the new mystery took place of the dispensation, due to loving kindness which deals with him who fell through disobedience. This is the reason for the generation and the virgin, for the manger and Bethlehem; the generation on behalf of the creation, the virgin on behalf of the woman, Bethlehem because of Eden, the manger because of the garden, small and visible things on behalf of great and hidden things. This is why the angels glorified first the heavenly, then the earthly, why the shepherds saw the glory over the Lamb and the Shepherd, why the star led the Magi to worship and offer gifts, in order that idolatry might be destroyed. This is why Jesus was baptized, and received testimony from above, and fasted, and was tempted, and overcame him who had overcome. This is why devils were cast out, and diseases healed, and the mighty preaching was entrusted to, and successfully proclaimed by men of low estate.
Source: Orations (New Advent)