We ought to marvel at the amount of utility that a smartphone has. Where once we had separate devices and tools, now we have a phone that is much more than a phone. We could not have conceived of the unity that exists for what was once separate. The birth of Jesus Christ is similar. In the Old Covenant, God promised an enduring priesthood, an enduring Davidic dynasty, and enduring sacrifice. And few saw that God would not send multiple people to fulfill His promise; He would only send One.