Hebrews 7:10

How? "For he was yet in his loins when Melchisedec met him," i.e. Levi was in him, although he was not yet born. And he said not the Levites but Levi. Hast thou seen the superiority? Hast thou seen how great is the interval between Abraham and Melchisedec, who bears the type of our High Priest? And he shows that the superiority had been caused by authority, not necessity. For the one paid the tithe, which indicates the priest: the other gave the blessing, which indicates the superior. This superiority passes on also to the descendants. In a marvelous and triumphant way he cast out the Jewish system. On this account he said, "Ye are become dull," because he wished to lay these foundations, that they might not start away. Such is the wisdom of Paul, first preparing them well, he so leads them into what he wishes. For the human race is hard to persuade, and needs much attention, even more than plants. Since in that case there is only the nature of material bodies, and earth, which yields to the hands of the husbandmen: but in this there is will, which is liable to many alterations, and now prefers this, now that. For it quickly turns to evil.