God is One and yet, Three and Three who are yet One (the Trinity) God created women and men for similar community, so that in a marriage two people become one, yet the one couple is still two people. This creation order survived the Fall, as Paul makes clear in his quotation from Genesis 2:24, “In the same way, husbands ought to love their wives as their own bodies. He who loves his wife loves himself… for this reason a man will leave his father and mother and be united to his wife and the two will become one flesh.” (Ephesians 5)
Amazing, isn’t it? God created us as separate individuals, yet made us capable of being an inseparable part of another human being. This definition of communal living applies to marriage; it also applies to the church. Look again at Ephesians 5. Just as it is biblical for husbands to love their wives as they love their own bodies, so also in the church: “after all, no one ever hated his own body, but he feeds and cares for it, just as Christ does the church – for we are members of his body.” Ephesians 5:29-30
Paul makes an astonishing correlation. Just as God is three in one and marriage partners are two in one so also in the church can separate individuals become INseparable parts of Christ’s body.
Romans 12:4-5 agrees: “Just as each of us has one body with many members, and these members do not all have the same function, so in Christ we you are many form one body and each member belongs to all the others.”
– Bill Donahue in Building a Church of Small Groups