Bonhoeffer writes about Christians and the world we live in, a world of government, politics, labor, and marriage. We do not 'live in a vacuum', therefore, we must have concrete instruction in a concrete situation. Bonhoeffer died before completing his work but this book is recognized as a major contribution to Christian ethics. He sees no division be tween church , family, labor, and government. We are re- sponsible before God in the world he made and we have re- sponsibilities for the institutions of that world.