If, then, Perfection had been attainable through the Levitical priesthood--and it was under this priesthood that the people received the Law--why was it still necessary that a priest of a different order should appear, a priest of the order of Melchizedek and not of the order of Aaron?

Then again, the appointment of this new priest was ratified by an oath, which is not so with the Levitical priests,

Again, new Levitical priests are continually being appointed, because death prevents their remaining in office;