German Lutheran pastor, theologian, and anti-Nazi resistance figure (1906-1945). From a prominent Berlin academic family, he was a gifted theologian at Berlin and Tübingen, influenced by Karl Barth's rejection of liberal theology. When Hitler came to power in 1933, Bonhoeffer publicly opposed him and helped lead the Confessing Church — the German Protestant minority that refused to accept Nazi ideology. He founded and led an underground seminary at Finkenwalde (1935-1937); his classic Life Together emerged from this community. He joined the Abwehr military intelligence agency as a double agent, participating in the conspiracy to assassinate Hitler. Arrested in April 1943, he was imprisoned at Tegel and later Flossenbürg; executed by special SS order on April 9, 1945, just weeks before the war ended, at age 39.
Bonhoeffer is the 20th century's most important Protestant martyr, and his theology is as potent as his witness. Four key works. (1) The Cost of Discipleship (1937) — his famous distinction between cheap grace ("grace without discipleship, grace without the cross, grace without Jesus Christ, living and incarnate") and costly grace ("it is costly because it calls us to follow, and it is grace because it calls us to follow Jesus Christ"). This is the most quoted line in 20th-century Christian ethics. (2) Life Together (1939) — his exposition of Christian community, written from the Finkenwalde experience. Every chapter convicts; the book has shaped pastoral practice for 80 years. (3) Letters and Papers from Prison (posthumously, 1951) — his reflections from cells in Tegel, sometimes read as proto-liberal or "religionless Christianity," but more accurately read as wrestling with what the Church should become in a post-Christian Europe. Bonhoeffer never compromised on historic orthodoxy. (4) Ethics (unfinished, posthumous) — his mature ethical framework. Bonhoeffer's life raises the hardest questions: can a Christian conspire to assassinate a tyrant? He concluded yes, with heavy grief. His fellow prisoners reported he went to the gallows serenely; the camp doctor wrote, "I have hardly ever seen a man die so entirely submissive to the will of God."