John Chrysostom
Since he pointed to the difference of the members, mentioning feet, hands, eyes, and ears, and thereby suggested the thought of lower and higher dignity, see how he again consoles and shows that this is profitable. A body is especially a body because its members are many and different. If they were all one, they would not make up a body. Therefore he says: "And if they were all one member, where would the body be?" (1 Cor 12:19). He says this later, but now he expresses something still greater. In that case there would not only be no body, but there would be no other members either: "If the whole were hearing," he says, "where would be the sense of smell?" Then, since his hearers could still be troubled, he does here what he did above.
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There, after consoling them by pointing to usefulness, he completely stopped their mouths by saying: "But one and the same Spirit works all these things, distributing to each one individually as He wills" (1 Cor 12:11). So also here, after proving that everything has been arranged profitably, he again attributes everything to the will of God and says: "But now God has set the members, each one of them, in the body just as He pleased" (1 Cor 12:18). As he said of the Spirit, "as He wills," so here also, "as He pleased." Therefore do not ask why it is so and why it is not otherwise. Even if we could present thousands of reasons, we could prove that this is good by nothing so powerfully as by the words: as the supreme Craftsman willed, so it came to be, because He wills what is profitable. If we must not be too inquisitive about the members in our body, much less should we be so in the Church. Notice the Apostle's wisdom. He points not to a difference of the members by nature or activity, but to a difference of local position: "But," he says, "God has set the members, each one of them, in the body just as He pleased." He rightly said, "each one," expressing the benefit of them all. You cannot say that the Lord arranged this member, but not that one. Each has been placed so by His will. It is profitable for the foot to be in precisely such a place, not only for the head to be in its own. If some member changed position, left its own place, and passed to another, then even if it seemed to occupy a better place, it would ruin and disorder everything. It would lose its own place and not attain the other's.