12 You can easily enough see how this kind of thing works by looking no further than your own body. Your body has many parts - limbs, organs, cells - but no matter how many parts you can name, you're still one body. It's exactly the same with Christ. 13 By means of his one Spirit, we all said good-bye to our partial and piecemeal lives. We each used to independently call our own shots, but then we entered into a large and integrated life in which he has the final say in everything. (This is what we proclaimed in word and action when we were baptized.) Each of us is now a part of his resurrection body, refreshed and sustained at one fountain - his Spirit - where we all come to drink. The old labels we once used to identify ourselves - labels like Jew or Greek, slave or free - are no longer useful. We need something larger, more comprehensive. 14 I want you to think about how all this makes you more significant, not less. A body isn't just a single part blown up into something huge. It's all the different-but-similar parts arranged and functioning together. 15 If Foot said, "I'm not elegant like Hand, embellished with rings; I guess I don't belong to this body," would that make it so? 16 If Ear said, "I'm not beautiful like Eye, limpid and expressive; I don't deserve a place on the head," would you want to remove it from the body? 17 If the body was all eye, how could it hear? If all ear, how could it smell?
Matthew Henry's Commentary on 1 Corinthians 12:12-17
Commentary on 1 Corinthians 12:12-26
(Read 1 Corinthians 12:12-26)
Christ and his church form one body, as Head and members. Christians become members of this body by baptism. The outward rite is of Divine institution; it is a sign of the new birth, and is called therefore the washing of regeneration, Titus 3:5. But it is by the Spirit, only by the renewing of the Holy Ghost, that we are made members of Christ's body. And by communion with Christ at the Lord's supper, we are strengthened, not by drinking the wine, but by drinking into one Spirit. Each member has its form, place, and use. The meanest makes a part of the body. There must be a distinction of members in the body. So Christ's members have different powers and different places. We should do the duties of our own place, and not murmur, or quarrel with others. All the members of the body are useful and necessary to each other. Nor is there a member of the body of Christ, but may and ought to be useful to fellow-members. As in the natural body of man, the members should be closely united by the strongest bonds of love; the good of the whole should be the object of all. All Christians are dependent one upon another; each is to expect and receive help from the rest. Let us then have more of the spirit of union in our religion.