Why do we get deep in the weeds about the priesthood of Melchizedek and the comparison to Aaron and the Levitical priesthood? Why try to show that Jesus is now a new great high priest of the order of Melchizedek? Because it reveals the amazing and intricately arranged nature of the Word of God. His Amazing Grace is not only revealed through His power to save, but also through the fulfillment of prophecy and promise.