John Chrysostom
Here the Apostle does not abolish free will, but shows the degree to which one must obey God. When you demand an account from God, you must feel yourself to be nothing more than clay. You must not only refrain from contradicting and asking questions, but not even speak or think. You must become like that lifeless clay which is obedient to the hands of the potter and is used by him as he desires.
For this very reason the Apostle took such an example, not as a model of life, but as proof of submissive and silent obedience. This must be observed everywhere. Examples must not be accepted whole and entire. One must select from them what is needed, for which they were brought forward, and cast aside everything else.
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When it is said, "He bowed down, he lay like a lion" (Num 24:9), we take only the notion of what is invincible and fearsome, not the beastly aspect or anything else proper to a lion. Again, when it is said, "I will attack them like a bear robbed of her cubs" (Hos 13:8), we take the notion of vengeance. When it is said, "God is a consuming fire" (Deut 4:24), we take the notion of destructive punishment. So also here one must understand the words clay, potter, and vessel.
When the Apostle adds and says, "Does not the potter have authority over the clay, from the same lump to make one vessel for honorable use and another for dishonorable?" do not think that Paul said this in the sense of creation, or to prove the necessity of the will. He said it to express authority and diversity in arrangements. If we do not understand his words in this sense, many absurd consequences will follow.
For if the discussion here concerns the will, then God will appear to be the maker of both good and evil, while man will not be at all guilty in either. Then it will appear that Paul, who everywhere crowns free will, contradicts himself. Therefore the Apostle wishes here to disclose nothing else than to persuade the hearer to obey God in all fullness, and in nothing to demand an account from Him.
As the potter, he reasons, makes from one and the same lump whatever he wishes, and no one contradicts him, so do not ask God and do not inquire curiously why, among men of one and the same race, He punishes some and rewards others. Rather, reverence Him and imitate the clay. As it is obedient to the hands of the potter, so you must submit to the will of the Ruler of the universe.
He does nothing without purpose or at random, even though you yourself do not comprehend the mystery of Wisdom. You allow the potter to prepare different wares from one and the same lump, and you do not blame him for it. Yet from God you demand an account concerning punishments and honors. You do not leave it to Him to know who is worthy and who is unworthy. Since the composition itself has one and the same substance, you suppose that the will is also one and the same in all. What groundlessness.
It does not depend on the potter that, from one and the same lump, one thing goes to honorable use and another to low use. It depends on the arrangement of those who use the object. So also here the matter depends on free will.
Moreover, as I said above, the example must be taken in this one respect: man must not contradict God, but must entrust everything to His incomprehensible wisdom. The example must be broader than the subject for which it is brought forward, so that it may act more strongly upon the hearers. If it were not broader and did not contain more within itself, it could not touch and stir the objector as it should.