In his fragmentary and incomplete Ethics, Dietrich Bonhoeffer examines the reality of the will of God, which he contends come to us from Scripture in the form of four mandates: work, marriage, government, and church. Here’s a great summary of Bonhoeffer’s view of the mandate of the government or state, from his essay, “Christ, Reality, and Good,” pages 72-73:
The divine mandate of government already presupposes the mandates of work and marriage. In the world that it rules, government finds already existing these two mandates through which God the Creator exercises creative power and upon which government must rely. Government itself cannot produce life or values. It is not creative. Government maintains what is created in the order that was given to the creation by God’s commission. Government protects what is created by establishing justice in acknowledgment of the divine mandates and by enforcing this justice with the power of the sword. Thus, marriage is not made by the government, but is affirmed by the government. The great spheres of work are not themselves undertaken by the government, but they are subject to its supervision within certain limits—later to be described—to governmental direction. Government should never seek to become the agent of these areas of work, for this would seriously endanger their divine mandate along with its own. By establishing justice, and by the power of the sword, government preserves the world for the reality of Jesus Christ. Everyone owes obedience to this government—according to the will of Christ.