They don’t keep themselves under the control of the head. Christ is the head, and the whole body depends on him. Because of Christ all the parts of the body care for each other and help each other. So the body is made stronger and held together as God causes it to grow.
He is the head of the body, which is the church. He is the beginning of everything else. And he is the first among all who will be raised from death. So in everything he is most important.
God made promises to Abraham and his Descendant. The Scripture does not say, “and to your descendants.” That would mean many people. But it says, “and to your Descendant.” That means only one, and that one is Christ.
I am happy in my sufferings for you. There is much that Christ must still suffer. And I gladly accept my part of those sufferings in my body for the good of his body, the church.