Luther does not restrict the theology of the cross to an objective revelation of God. He also sees it as the key to understanding Christian ethics and experience. Foundational to both is the role of faith: to the eyes of unbelief, the cross is nonsense; it is what it seems to be—the crushing, filthy death of a man cursed by God. That is how the unbelieving mind interprets the cross—foolishness to Greeks and an offence to Jews, depending on whether your chosen sin is intellectual arrogance or moral self-righteousness. To the eyes opened by faith, however, the cross is seen as it really is. God is revealed in the hiddenness of the external form. And faith is understood to be a gift of God, not a power inherent in the human mind itself.
This principle of faith then allows the believer to understand how he or she is to behave. United to Christ, the great king and priest, the believer too is both a king and a priest. But these offices are not excuses for lording it over others. In fact, kingship and priesthood are to be enacted in the believer as they are in Christ—through suffering and self-sacrifice in the service of others. The believer is king of everything by being a servant of everyone; the believer is completely free by being subject to all. As Christ demonstrated his kingship and power by death on the cross, so the believer does so by giving himself or herself unconditionally to the aid of others. We are to be, as Luther puts it, little Christs to our neighbors, for in so doing we find our true identity as children of God.
This argument is explosive, giving a whole new understanding of Christian authority. Elders, for example, are not to be those renowned for throwing their weight around, for badgering others, and for using their position or wealth or credentials to enforce their own opinions. No, the truly Christian elder is the one who devotes his whole life to the painful, inconvenient, and humiliating service of others, for in so doing he demonstrates Christlike authority, the kind of authority that Christ himself demonstrated throughout his incarnate life and supremely on the cross at Calvary.
Prof. Trueman is Presbyterian, so he talks about “elders,” but what he says and what Luther says about being “little Christs to our neighbors” (from The Freedom of the Christian) is at the essence of the doctrine of vocation. It speaks to a Christian’s exercise of authority in all of the estates: in the church (pastors); in the state (rulers, citizens); and in the household (marriage, parenthood, the workplace).
Thus, we can say that husbands do indeed have authority over their wives; but the Christian husband should use that authority in self-denying, cross-bearing service to her. The same holds true for the authority of parents over their children, bosses over their employees, and lawful rulers over their charges. This rules out every kind of tyranny and self-serving imposition of power.
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