John Chrysostom
Here is the third reason. He shows that when someone leaves the parents from whom he came and is joined to his wife, then the father, the mother, and their child are one flesh.
This one flesh is formed from their mutual union, because the child is born from the mingling of seed. Thus the three are one flesh.
In the same way, we become one flesh with Christ through communion. Indeed, we do so far more than a child is one flesh with its parents. Why? Because this was so from the beginning.
Do not tell me that your wife is this or that. Do you not see that there are many defects even in the flesh? One man is lame, another has crooked legs, another has withered hands, and another suffers in some other member.
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Yet he does not grieve over it or cut it off. Often he cares for it more than the others. And rightly so, for it is his member.
Therefore the Apostle wants us to have toward our wife the same love each of us has for himself. This is not only because we share one nature with her. We have a far greater reason regarding the wife.
The reason is that husband and wife are not two bodies, but one: he is the head, and she is the body. But how does he say elsewhere, “the head of Christ is God” (1 Cor 11:3)?
This is what I too say: as we are one body, so Christ and the Father are one. Thus it follows that the Father also is our head.
The Apostle sets forth two comparisons, one with the body and one with Christ. Therefore he adds, “This mystery is great; but I speak concerning Christ and the Church” (v. 32).