When Paul describes a Christian husband as the ‘head’ of his wife, in the same way that Christ is the ‘head’ of the church, I think he is attempting a number of things.
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In a culture where wives were often regarded as both chattels and easily expendable, he wishes to redefine a husband’s understanding of his responsibilities towards his wife in the following way: a Christian husband is fully committed for life, sexually faithful, monogamous, self-sacrificial, and endlessly loving.
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In a culture where women and girls were largely uneducated or invested in in any way, and where men would have held all the power and education, he wishes to give Christian husbands the task of building up their wives into spiritual maturity, nourishing and nurturing them as ones who are equal heirs of the riches of grace poured out on them by Christ.
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The best concept to use when attempting to find an idea that applies both to Christ and the church and to husbands and wives (which I think is also transferable to the God/Christ and Christ/husband pairings) is the idea of the ‘cornerstone’ or ‘foundation’ upon which a structure is built up, and through which all things hold together.