In a marvelous and triumphant way he cast out the Jewish [system]. On this account he said, “Ye are become dull,” ( c. v. 12 ), 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.