The husband is compared with Christ, and the wife with the Church. The point of comparison is headship: the husband is head of the wife, as Christ is Head of the Church.
Yet the Apostle does not write simply what is, but what ought to be. Therefore his words should be understood thus: the husband is head of the wife in the same sense in which Christ is Head of the Church.
But Christ is Head of the Church as the Savior of His body. Let the husband also be head to the wife because he is her savior.
In this let the husband find the foundation of his headship, and the wife the motive for obedience.
After saying, “the husband is head of the wife, as Christ is of the Church,” the Apostle needed only to draw the conclusion: therefore let wives obey their husbands in everything, as the Church obeys Christ.
This he does in the following verse. But he intentionally added the statement that explains why Christ is Head of the Church.
By it he gives Christian foundation to the husband’s headship and a most moral motive to the wife’s obedience, namely: “He is the Savior of the body.”
Christ is Head of the Church because He is the Savior of this body of His. He became Head through saving those who were saved, and the saved became His members through salvation.
By placing the husband’s headship over the wife alongside Christ’s headship over the Church, as her Savior, does he not indicate that the husband must show himself the wife’s savior?
Then the wife too will see in him her savior. In the feeling that he is her defense, guardian, and shelter, and that behind him she stands as behind a mountain, she must hold and enliven her obedience to him.
Theophylact writes: “As Christ, being Head of the Church, provides for her and saves her, so the husband is the savior of the wife, his own body. How should this body not obey the head that cares for it and saves it?”
“Thus,” says St. Chrysostom, “he set before husband and wife, as the foundation of their happiness, mutual love and care. He assigned to each what is fitting: to the one, authority and care; to the other, obedience.”
The same thought is found in Blessed Theodoret: “The divine Apostle presented this example with great wisdom. It is sufficient both to instill reverence for their husbands in wives, and to place tender love for their wives in husbands.”