In April 1943 Bonhoeffer was arrested and imprisoned. He was eventually moved to Flossenburg concentration camp and executed just before the end of World War II.
How did Bonhoeffer live out his own words? His forgiveness was costly suffering, because it actually confronted the hurt and evil before him. His forgiveness was not what he called (in The Cost of Discipleship) “cheap grace.” He did not ignore or excuse sin. He resisted it head on, even though it cost him everything. His forgiveness was also costly because he refused to hate. He past through the agonizing process required to love your enemies, so his resistance to their evildoing was measured and courageous, not venomous and cruel. The startling evidence for this is found in the letters and papers that Bonhoeffer wrote while in prison. The lack of bitterness was remarkable.
Please don’t ever get anxious or worried about me, but don’t forget to pray for me—I’m sure you don’t. I am so sure of God’s guiding hand that I hope I shall always be kept in that certainty. You must never doubt that I am traveling with gratitude and cheerfulness along the road where I’m being led. My past life is brim-full of God’s goodness and my sins are covered by the forgiving love of Christ crucified.
Here we see Bonhoeffer simply living out what Jesus had done for him. Jesus bore his sins, bearing the cost of them. Now Bonhoeffer is free to do the same for others. Bonhoeffer uses divine forgiveness to help him understand human forgiveness to understand the divine.
The Forgiveness of God
“Why did Jesus have to die? Couldn’t God just forgive us?” This is what many ask, but now we can see that no one “just” forgives, if the evil is serious. Forgiveness means bearing the cost instead of making the wrongdoer do it, so you can reach out to love and to seek your enemy’s renewal and change. Forgiveness means absorbing the debt of the sin yourself. Everyone who forgives great evil goes through a death into resurrection, and experiences nails, blood, sweat and tears.
Should it surprise us, then, that when God determined to forgive us rather than punish us for all the ways we have wronged Him and one another, that he went to the cross. . . and died there? As Bonhoeffer says, everyone who forgives someone bears the other’s sins. On the Cross we see God doing visibly and cosmically what every human being must do to forgive someone, though on an infinitely greater scale. I would argue, of course, that human forgiveness works this way because we unavoidably reflect the image of our Creator. That is why we should not be surprised that if we sense the only way to triumph over evil is to go through the suffering of forgiveness, that this would be far more true of God, whose just passion to defeat evil and loving desire to forgive others are both infinitely greater than ours.
. . . . Therefore the Cross is not simply a lovely example of sacrificial love. Throwing your life away needlessly is not admirable—it is wrong.6 Jesus’s death was only a good example if it was more than an example, if it was something absolutely necessary to rescue us. And it was. Why did Jesus have to die in order to forgive us? There was a debt to be paid—God himself paid it. There was a penalty to be born—God himself bore it. Forgiveness is always a form of costly suffering. ~Timothy Keller, The Reason for God (Penguin Books, Random House, 2016), 198-200

