Jesus had become one of us, but now by the Spirit he would wonderfully become one with us. ‘For this is the design of the gospel,’ wrote John Calvin, ‘that Christ may become ours, and that we may be ingrafted into his body.’…
The image Jesus used to explain all this, that night before his execution, was that of the Lord’s Supper; ‘he  took bread,  gave thanks and  broke it, and  gave it to them, saving, “This is my body given for you”‘ (Luke 22:19). Now if the bread is really all about his body, then in four little actions Jesus managed to encapsulate all that he was doing. He had come down from heaven and (1) taken a body; as a man and in that body he had lived a life of (2) giving thanks to God; he would then lay down that life, (3) breaking his body on the cross- and all so that, in the end, he could (4) give himself to us.
Jesus, then, does not have some loose affiliation with his people, some contract that depends on our faithfulness. Like the bread and wine we take into our bodies in communion, he enters us by his Spirit and becomes one with us. In him, the divorces and divisions of sin are undone; the divorce between humanity and God, between person and person, between man and woman, between black and white, Jew and Gentile. In him we are brought together and made one: one body; one loaf; one with each other and one with him:
His purpose was to create in himself one new humanity out of the two, thus making peace, and in one body to reconcile both of them to God through the cross, by which he put to death their hostility. He came and preached peace to you who were far away and peace to those who were near. For through him we both have access to the Father by one Spirit. (Ephesians 2:15-18)
-Michael Reeves, Christ Our Life (UK). Pages 69-70.
NOTE: The US version is entitled Rejoicing in Christ