The promises were given to Abraham. They were also given to his seed. Scripture does not say, “and to seeds.” That means many people. It says, “and to your seed.” (Genesis 12:7; 13:15; 24:7) That means one person. And that one person is Christ.
And he is the head of the body, which is the church. He is the beginning. He is the first to be raised from the dead. That happened so that he would be far above everything.
I am happy because of what I am suffering for you. My suffering joins with and continues the sufferings of Christ. I suffer for his body, which is the church.
They aren’t connected anymore to the head, who is Christ. But the whole body grows from the head. The muscles and tendons hold the body together. And God causes it to grow.