The Cost of Discipleship by Dietrich Bonhoeffer — A Book Summary

The Book Written by a Man Who Paid the Price

Before you read a single word of The Cost of Discipleship, you need to know one thing about the man who wrote it.

Dietrich Bonhoeffer was a German pastor, theologian, and professor — brilliant by any measure, the son of a distinguished family, a man who by his early thirties had already earned international recognition as one of the most gifted theological minds of his generation. In 1939, with war gathering on the horizon and the Nazi regime tightening its stranglehold on Germany and its churches, Bonhoeffer was offered a safe academic position in the United States. He could have stayed. He chose to go back.

He returned to Germany because he believed that a man who had written a book about what it costs to follow Jesus had no business escaping to safety when his own nation needed someone willing to pay that price. He joined the resistance. He participated in a plot to assassinate Adolf Hitler. He was arrested in 1943, imprisoned, and on April 9, 1945 — just two weeks before the Allied forces liberated the concentration camp where he was held — Dietrich Bonhoeffer was executed by the Nazis. He was thirty-nine years old.

The Cost of Discipleship was not written by a theorist. It was written by a martyr who saw what he was writing coming and wrote it anyway.

Published first in German in 1937 under the title Nachfolge, the book brings Bonhoeffer’s unique experience of watching the German church capitulate to Hitler into a sustained theological argument: the inseparability of faith and action, epitomized in the contrasting concepts of “cheap grace,” which requires nothing from its adherents, and “costly grace,” which calls for an unwavering, sacrificial commitment to Jesus Christ.

It is one of the most important Christian books of the twentieth century. It is also, quite possibly, the most uncomfortable.

The Central Argument

The thesis of The Cost of Discipleship can be stated in a sentence, and Bonhoeffer states it memorably: When Christ calls a man, He bids him come and die.

That sentence is not a metaphor. It is not an invitation to occasional inconvenience or periodic self-reflection. Bonhoeffer means it theologically, practically, and — as his own life demonstrated — literally. To follow Jesus is to die to self, to die to the world’s claims upon you, to die to the comfortable, accommodated, culturally approved version of Christianity that the German church of the 1930s had perfected and that Bonhoeffer watched, with growing horror, produce not resistance to evil but collaboration with it.

The root problem is what he calls “cheap grace.” And its opposite — the only grace the New Testament actually offers — is costly. The entire book is an unpacking of what that costliness demands and what it makes possible.

Bonhoeffer is careful to insist that this rigorous discipleship is not a faith for the elite few. For him, true discipleship is liberating and universal, leading to “a road of boundless mercy.” He writes: “Only Jesus Christ, who bids us follow him, knows the journey’s end. But we do know that it will be a road of boundless mercy.”

Part One: Grace and Discipleship

Cheap Grace and Costly Grace

“Cheap grace is the preaching of forgiveness without requiring repentance, baptism without church discipline, Communion without confession, absolution without personal confession. Cheap grace is grace without discipleship, grace without the cross, grace without Jesus Christ, living and incarnate.”

Cheap grace is not merely inadequate theology. It is deadly. Bonhoeffer calls it “the deadly enemy of our Church” and “the justification of the sin without the justification of the sinner.” It is, in his unforgettable phrase, “the grace we bestow on ourselves.”

Costly grace is the opposite in every way. Bonhoeffer describes it with breathtaking compression: “Costly grace is the Incarnation of God.” It is the grace that called Abraham out of his homeland. It is the grace that sent the disciples to leave their nets on the shore.

“Happy are they who know that discipleship simply means the life which springs from grace, and that grace simply means discipleship.” Grace and discipleship are not in tension. They are the same thing, seen from two angles. To receive the grace of God is to be claimed by Jesus. To be claimed by Jesus is to follow Him.

“The only man who has the right to say that he is justified by grace alone is the man who has left all to follow Christ. Such a man knows that the call to discipleship is a gift of grace, and that the call is inseparable from the grace. But those who try to use this grace as a dispensation from following Christ are simply deceiving themselves.”

The Call to Discipleship

Bonhoeffer turns to the Gospel accounts of how Jesus actually called His disciples — and what strikes him is the radical simplicity and immediacy of every encounter. Jesus said “Follow me” and they followed. There was no doctrinal discussion. No period of consideration. No negotiation of terms.

“The call goes forth, and is at once followed by the response of obedience.”

This leads to one of the book’s most provocative and frequently debated claims: “The disobedient cannot believe; only the obedient believe.”

This is not a claim that obedience earns faith. It is a claim about the nature of authentic faith: real faith, by definition, takes the shape of the One in whom it trusts. Faith in a crucified and risen Lord inevitably produces a cruciform life.

“Discipleship is not an offer that man makes to Christ.” The initiative is always Christ’s. The disciple responds. And the response is the beginning of everything.

Part Two: The Sermon on the Mount

The longest section of the book is a sustained meditation on the Sermon on the Mount — which Bonhoeffer treats not as an idealistic ethic beyond ordinary human reach but as the actual description of what discipleship looks like in the world.

The Beatitudes. The people Jesus pronounces blessed are not the successful, the admired, or the religiously accomplished. They are the poor in spirit, the mourners, the meek, the persecuted. These are descriptions of what happens to people who follow Jesus into the world as He encountered it.

The Righteousness Greater Than the Pharisees. Jesus is not abrogating the law but radicalizing it, pushing past external compliance into the depths of the human heart. The disciple is not merely forbidden from murder — the disciple is called to eliminate the anger from which murder grows. Not merely from adultery — but from the lust that precedes it. This inward radicalization is the heart of what distinguishes genuine discipleship from religious performance.

Love of Enemies. “Christian love draws no distinction between one enemy and another, except that the more bitter our enemy’s hatred, the greater his need of love. Be his enmity political or religious, he has nothing to expect from a follower of Jesus but unqualified love. In such love there is no inner discord between the private person and official capacity. In both we are disciples of Christ, or we are not Christians at all.”

“The will of God, to which the law gives expression, is that men should defeat their enemies by loving them.” This is not sentimentality. It is the logic of the Cross — the defeat of evil not through superior force but through the willingness to absorb it, to bear it, to refuse to return it.

Hidden Righteousness. The disciple’s righteousness is not performed for an audience. It is practiced before God alone, in secret, because the disciple has no interest in the approval of the crowd — only in the will of the Father.

Earthly Possessions and the Carefree Life. “Earthly goods are given to be used, not to be collected. Where our treasure is, there is our trust, our security, our consolation and our God. Hoarding is idolatry.” The disciple lives in radical dependence on God — not as an exercise in spiritual heroism but as the natural posture of someone who has genuinely placed their trust in One who is more reliable than any accumulation of earthly security.

Part Three: The Messengers of Christ

Sent Into the World. “The messengers of Jesus will be hated to the end of time. They will be blamed for all the division which rends cities and homes. Jesus and his disciples will be condemned on all sides for undermining family life, and for leading the nation astray; they will be called crazy fanatics and disturbers of the peace.” This is not pessimism. It is realism grounded in the pattern of Jesus Himself. The suffering of the messengers is itself part of the message.

The Cross as Daily Reality. “To endure the cross is not a tragedy; it is the suffering which is the fruit of an exclusive allegiance to Jesus Christ.” Every disciple has their cross. It is the point at which obedience to Christ creates conflict with the world. The cross is not chosen by the disciple; it is assigned. But it is carried willingly, in the company of the One who carried the original.

Part Four: The Church of Jesus Christ

Discipleship is never merely individual. It is always communal — the life of a people who have been called together by the same voice and sent out by the same command.

The book’s closing theological argument concerns the restoration of the imago Dei through Christ. The image that was distorted through disobedience is restored not through human effort but through the Incarnation of Jesus Christ. “It is only because he became like us that we can become like him.” The disciple is someone being conformed to that image — becoming, over time, through obedience and suffering and love and prayer, someone who looks more and more like Jesus.

Notable Concepts

Cheap Grace as the Great Danger. Every generation of the church faces the temptation to offer a version of Christianity that costs nothing and therefore changes nothing. Cheap grace is not merely inadequate — it is worse than no grace at all, because it inoculates the recipient against the real thing.

Obedience as the Ground of Faith. Faith is not a feeling or a proposition to which one gives intellectual assent. It is a posture of the whole person — mind, will, body, time, treasure — turned toward Christ in obedience.

The Mediator Between Everything. “He stands between us and God, and for that very reason he stands between us and all other men and things. He is the Mediator, not only between God and man, but between man and man, between man and reality.” Every relationship, every possession, every loyalty is now mediated through Christ — everything held loosely, in open hands.

The Fruit of the Spirit as Gift, Not Achievement. “Fruit is always the miraculous, the created; it is never the result of willing, but always a growth. The fruit of the Spirit is a gift of God, and only He can produce it. They who bear it know as little about it as the tree knows of its fruit. They know only the power of Him on whom their life depends.” The disciple is responsible for abiding in the Vine. What grows from that abiding is not their achievement — it is His gift.

Theological Perspective and Historical Context

The Cost of Discipleship was written in the shadow of one of history’s darkest moments. Bonhoeffer wrote the book while teaching at the underground seminary of the Confessing Church in Finkenwalde, Germany — a seminary that existed because the official German church had accommodated itself to Nazi ideology, and a remnant of pastors had refused.

The German church’s capitulation to Hitler was, for Bonhoeffer, the most dramatic possible demonstration of what cheap grace produces: a Christianity so stripped of its demands, so comfortable with power, so unwilling to take up any cross, that it could watch the systematic persecution and murder of human beings and find no theological resources with which to resist.

Strengths of the Book

The supreme strength of The Cost of Discipleship is the weight of the life behind it. Bonhoeffer did not write about martyrdom from a safe distance. He wrote it, and then he lived it, and then he died for it. That biographical reality gives every page a gravity that no amount of theological skill alone could produce.

A second strength is Bonhoeffer’s exegetical patience. He works carefully through the text of the Gospels, especially the Sermon on the Mount, letting the words of Jesus do the heaviest lifting.

A third strength is the book’s refusal to make discipleship either impossible or optional. Following Jesus is genuinely costly, genuinely demanding, genuinely transformative — and it is also the only path to genuine freedom, genuine love, and genuine life. The cross is not a burden added to life. It is the condition of its fullness.

Ideal Reader

The Cost of Discipleship is the right book for the Christian who has grown suspicious that the version of faith they have been offered is somehow too easy — that something has been left out, that the Jesus of the Gospels is more demanding and more glorious than the Jesus they have encountered in consumer Christianity. It is essential reading for pastors and seminary students who will spend their lives forming disciples and need to understand what that word actually means.

It is also, perhaps especially, the right book for those living in moments of moral and political crisis — moments when the Church is tempted to accommodate itself to power, to offer its blessing to Caesar, to exchange its prophetic calling for cultural approval.

A Final Word

There is a photograph of Dietrich Bonhoeffer that has become iconic. He is young — younger than most people realize when they read his books. He is smiling. He does not look like a man walking toward a gallows. He looks like a man who knows something.

What he knew was what he wrote. He knew that when Christ calls a man, He bids him come and die. And he knew — because he had studied it, meditated on it, taught it, lived it — that on the other side of that death is everything the soul was made for.

His promise to every reader who follows him into the rigor and beauty of genuine discipleship: “We do know that it will be a road of boundless mercy.”

The cost is real. So is the mercy. And the Man who calls you to pay the one will never leave you without the other.

“When Christ calls a man, He bids him come and die.” — Dietrich Bonhoeffer