What need was there then of another priesthood? “For the priesthood being changed, there is of necessity a change of the law also.” But if there must be another priest, or rather another priesthood, there must needs be also another law. This is for those who say, What need was there of a new Covenant? For he could indeed have alleged a testimony from prophecy also. “This is the covenant which I made with your fathers” [&c.]. ( c. viii. 10.) But for the present he contends on the ground of the priesthood. And observe, how he says this from the first. He said, “According to the order of Melchisedec.” By this he excluded the order of Aaron. For he would not have said “After the order of Melchisedec,” if the other had been better. If therefore another priesthood has been brought in, there must be also [another] Covenant; for neither is it possible that there should be a priest, without a covenant and laws and ordinances, nor that having received a different priesthood He should use the former [covenant].