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Christian ethics is not only about principles; it is about action — and about the theology that motivates it. The AQA specification approaches "good conduct and key moral principles" by asking how Christians understand the relationship between faith, works and salvation (justification by faith versus works, and predestination), and then by studying a concrete case of costly Christian moral action: the life and thought of Dietrich Bonhoeffer, the German pastor executed by the Nazis for his part in the resistance. This lesson sets out the theology of "good conduct," examines Bonhoeffer's costly grace, discipleship, ecclesiology and resistance precisely, and weighs the central evaluative questions — above all, whether his turn to conspiracy and violence can be reconciled with Christian discipleship.
Before examining moral action, we must grasp the theology of how good conduct relates to salvation, because Christians disagree about whether right action contributes to being saved or flows from a salvation already given.
Key term: Justification is the act by which God declares a sinner to be righteous, restoring their relationship with him. The disputed question is how a person is justified — by faith, by works (good deeds), or by some combination.
The Protestant Reformation turned on this issue. Martin Luther, agonising over his own inability to earn God's favour, found release in Paul's teaching that "a person is justified by faith apart from works prescribed by the law" (Romans 3:28) and that "the one who is righteous will live by faith" (Romans 1:17). He concluded that justification is by faith alone (sola fide), received as a free gift of grace, not earned by religious works — a direct attack on the medieval system of merit, penance and indulgences. On this view, good works are the fruit and evidence of a living faith, not its cause; the believer is saved for good works, not by them.
The Catholic tradition, while equally insisting that salvation begins in grace, has held that faith must be "formed by love" and expressed in works that genuinely co-operate with grace; it points to the Letter of James — "faith without works is dead" (James 2:26) — and "a person is justified by works and not by faith alone" (James 2:24). The apparent tension between Paul and James is a classic exam point: Protestants typically harmonise them by saying James means that saving faith will inevitably show itself in works, so that workless "faith" is not real faith at all. The Joint Declaration on the Doctrine of Justification (1999), agreed between the Roman Catholic Church and the Lutheran World Federation, found a remarkable degree of common ground, affirming together that sinners are justified by grace through faith in Christ.
Key term: Predestination is the doctrine that God, before creation, determines who will be saved. Double predestination (associated with John Calvin) holds that God both elects some to salvation and passes over or condemns others; single predestination emphasises only God's election of the saved.
Calvin developed the doctrine from Paul's language of God choosing and calling (Romans 8:29–30; Ephesians 1:4–5) and from a strong sense of God's sovereignty and human inability. If salvation is entirely God's gift and humans are unable to save themselves, then the decisive factor is God's eternal choice, not human merit. The doctrine raises sharp questions: does it make God unjust (condemning the non-elect through no fault of their own)? Does it remove the point of moral effort? Calvinists answer that the elect are known by their fruits — a transformed, obedient life is the evidence of election — so that, far from making conduct irrelevant, predestination motivates a disciplined, grateful holiness (a connection Max Weber later linked to the "Protestant work ethic"). Arminians and Catholics reject double predestination, insisting that God genuinely wills all to be saved (1 Timothy 2:4) and that human free response has a real role.
Why does this seemingly abstract debate matter for moral action? Because the answer shapes the motive of the Christian life. If good works earn salvation, conduct can become anxious bargaining with God; if salvation is wholly of grace, good works flow instead from gratitude and love, performed freely rather than to secure a reward. The mainstream Christian conviction — held by Protestant and Catholic alike, for all their differences over the mechanism — is that the morally transformed life is the natural fruit of grace received, "faith working through love" (Galatians 5:6). It is exactly this conviction, that real faith must issue in costly obedience, that Bonhoeffer made the centre of his life and thought.
| Position | How are we saved? | Role of good works |
|---|---|---|
| Lutheran / Reformed (faith) | By grace through faith alone (sola fide) | The fruit and evidence of faith, not its cause |
| Roman Catholic | By grace, through faith formed by love and expressed in works | Works co-operate with grace; faith without works is dead |
| Calvinist (predestination) | By God's eternal election | A holy life is the sign of election, not its purchase |
| Arminian | By grace, with genuine free human response | Free acceptance and obedience matter really |
The theology of good conduct issues in concrete moral principles that the specification names. The sanctity of life — the conviction that human life is sacred because made in God's image (Genesis 1:27) and given by God — grounds Christian positions on killing, from the protection of the unborn to debates about euthanasia. On war, Christians divide between pacifism and the just war tradition, with the advent of weapons of mass destruction sharpening the question, since indiscriminate nuclear weapons appear to violate the just-war requirements of proportionality and discrimination between combatants and civilians. On the environment, the principle of stewardship holds that humanity's God-given dominion over creation (Genesis 1:28) is a trust to care for the earth on God's behalf, not a licence to exploit it — increasingly central to Christian ethics in an age of ecological crisis. These principles show that "good conduct" is not an abstraction: it is worked out in life-and-death decisions, and it is the seedbed of the costly action Bonhoeffer's life exemplifies.
This theological background frames the study of Bonhoeffer, whose central category — costly grace — is precisely an attempt to hold grace and obedient action together, against a Protestantism he thought had cheapened grace into a faith that demands nothing.
Dietrich Bonhoeffer (1906–1945) was born into a cultured, academic German family. A brilliant student, he completed his doctorate in theology at twenty-one and spent 1930–31 at Union Theological Seminary in New York, where worship at the Abyssinian Baptist Church in Harlem and exposure to the realities of racial injustice deeply marked him. He returned to Germany just as the Nazi movement was rising to power, and his theology was forged in the struggle that followed.
| Date | Event |
|---|---|
| 1933 | The Nazis take power; Bonhoeffer publicly opposes the Aryan Paragraph, which sought to exclude Christians of Jewish descent from Church office, and warns against the Führer principle |
| 1934 | The Confessing Church (Bekennende Kirche) is formed in opposition to the Nazi-aligned "German Christians"; the Barmen Declaration (largely drafted by Karl Barth) rejects state control of the gospel |
| 1935–37 | Bonhoeffer leads an illegal seminary at Finkenwalde; this period produces Discipleship (The Cost of Discipleship, 1937) and Life Together (1939) |
| 1939 | He briefly returns to the USA but comes back to Germany, writing that he would have no right to share in rebuilding Christian life after the war if he did not share his people's trials now |
| 1940–43 | Working within the Abwehr (military intelligence), he becomes part of the conspiracy against Hitler, using ecumenical contacts to pass information to the Allies |
| April 1943 | Arrested by the Gestapo; he continues to write from prison (Letters and Papers from Prison) |
| 9 April 1945 | Hanged at Flossenbürg concentration camp, weeks before the German surrender |
Bonhoeffer's most famous contribution, set out in the opening of The Cost of Discipleship (German Nachfolge, 1937), is the contrast between cheap and costly grace — his direct challenge to the "faith without works" he saw corrupting the German Church.
Key term: Cheap grace is, in Bonhoeffer's words, "grace without discipleship, grace without the cross, grace without Jesus Christ" — the preaching of forgiveness without repentance, baptism without church discipline, communion without confession; grace as a doctrine that costs the believer nothing. Costly grace is "the treasure hidden in the field," for which a person will sell all they have: "it is costly because it costs a man his life, and it is grace because it gives a man the only true life."
The point connects directly to the justification debate above. Bonhoeffer did not reject Luther's sola fide; he feared it had been misused — turned into a licence to be forgiven without being changed. He put it sharply: Luther's insight that grace is free had become, in the hands of his heirs, "the justification of sin rather than the justification of the sinner." Grace is genuinely free, but it is not cheap: it lays total claim on the believer's life. "When Christ calls a man, he bids him come and die" — the call to follow is a call to die to the old self and, if necessary, to die in fact.
Discipleship (Nachfolge, literally "following after") therefore means concrete, single-minded obedience to the call of Christ, not assent to a doctrine. Bonhoeffer insisted on "the obedience of the first step": one obeys the call before fully understanding it, as the disciples left their nets immediately. The Sermon on the Mount, which the "impossible ideal" interpretation had safely shelved, is for Bonhoeffer a description of the life Christ's followers are actually summoned to live — "only the believer is obedient, and only the obedient believe." This is Bonhoeffer's answer to a comfortable Christianity that had made its peace with the Nazi state: a Church that preaches forgiveness without demanding obedience will produce believers who resist nothing, and a faith that costs nothing will defend no one. The contrast can be set out directly.
| Cheap grace | Costly grace |
|---|---|
| Forgiveness preached without repentance | Forgiveness that summons to repentance and new life |
| Grace as a possession, a doctrine, a system | Grace as a living call to follow Christ |
| Discipleship optional; the cross avoided | "Come and die" — the cross taken up |
| Faith that leaves the believer unchanged | Faith inseparable from obedient action |
Notice how elegantly "costly grace" navigates the faith-versus-works tension set out earlier. Bonhoeffer does not say works earn salvation (that would be the legalism Luther fought); he says that real, saving faith is inseparable from obedient discipleship — exactly the harmonisation of Paul and James that most Protestants offer. Grace remains free and unearned, but it is never workless, because it is the call of a living Lord to follow him. This is why his theology of good conduct is not a retreat from the Reformation but its recovery: he restores the costliness that sola fide always implied but that had been quietly forgotten.
Bonhoeffer's vision of discipleship was profoundly communal; he had little patience for a privatised, individualistic faith. In Life Together (1939), drawn from the shared life at Finkenwalde, he argued that Christian community is not a human ideal we construct but a divine reality given in Christ: believers are bound together not because they naturally like one another but because Christ stands between and among them, mediating every relationship. A striking consequence is that genuine love for others is never direct possession or emotional dependence but always passes through Christ — which both frees the other person to be themselves and frees the community from the tyranny of strong personalities. The community lives from the Word of God — Scripture, prayer, confession and mutual service — and must beware the "wish-dream" of an idealised fellowship, which turns to bitterness when real, flawed people fail to match it. "He who loves his dream of a community more than the Christian community itself becomes a destroyer of the latter," Bonhoeffer warned: the person in love with their idea of community will wreck the real one.
Key term: Stellvertretung (vicarious representative action) is Bonhoeffer's idea that to be human, and supremely to be Christ, is to act and stand in the place of others, bearing their burdens. Christ is the supreme Stellvertreter, standing in humanity's place; Christians, conformed to Christ, are likewise called to "bear one another's burdens" (Galatians 6:2) and to act responsibly on behalf of their neighbours — even at personal cost.
This concept is the bridge from Bonhoeffer's churchmanship to his resistance: if to follow Christ is to stand in the place of others and bear their burdens, then to stand by while others are murdered is itself a failure of discipleship.
From prison, in the fragments collected as Letters and Papers from Prison (published 1951), Bonhoeffer pressed a final, provocative theme. He asked what Christianity could mean for a world "come of age" (mündige Welt) — a humanity that had learned to explain and manage life without invoking God to fill the gaps.
Key term: Religionless Christianity is Bonhoeffer's call for a faith stripped of "religion" understood as a separate, private, otherworldly compartment, or as a "God of the gaps" wheeled in to explain what science cannot. The true God, he argued, is met not at the edges of life in our weakness but at its centre, in strength and suffering alike; "God would have us know that we must live as those who manage their lives without him."
His repeated question was "Who is Christ for us today?" His answer: Christ is "the man for others," and the Church must therefore be the "Church for others," existing not for its own survival but for the world. He even suggested the Church should give away its property to those in need and that its clergy should live from voluntary gifts and ordinary work — a Church defined by service rather than self-preservation.
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