Two Kingdoms

Martin Luther's doctrine of the two kingdoms distinguishes God's spiritual rule, exercised through the gospel and operating on the inner person's conscience and relationship with God, from God's temporal rule, exercised through civil government and the sword, operating on outward conduct and social order among sinners regardless of their faith. Both kingdoms, on Luther's account, are genuinely instituted by God and neither is subordinate to the other in the way medieval two swords theory made temporal power subordinate to spiritual power, a sharp break from the dominant medieval Western Christian model.

Civil government, for Luther, does not require Christian faith to be legitimate and does not need the church's sanction to exercise its proper function of restraining evil and preserving order, a position that let Luther support the German princes' authority to suppress the Peasants' War in 1525 as a legitimate exercise of temporal government's God given task, a position for which Luther has since drawn considerable criticism. The doctrine gave Lutheran political theology a distinctive account of why Christians owe genuine obedience to secular authority even when that authority is not itself Christian or acting in an explicitly religious capacity.

Twentieth century history gave two kingdoms theology its most severe test and its most serious internal critics: some German Lutheran leaders invoked the doctrine's separation of spiritual and temporal authority to justify quietism or accommodation toward the Nazi state in the 1930s, treating political resistance as outside the church's proper spiritual sphere, a use the Confessing Church movement, including theologians such as Dietrich Bonhoeffer, rejected as a serious misapplication of Luther's own teaching.

Contemporary Lutheran and broader Protestant political theology remains divided over how to read Luther correctly on this point, with some scholars arguing the doctrine was never meant to silence the church's prophetic voice against manifest civil injustice and others treating the doctrine's historical use as a caution about a real internal weakness in its logic. Two kingdoms theology is frequently compared with and distinguished from Byzantine symphonia and the medieval Catholic two swords doctrine, since all three address the same underlying question, how spiritual and temporal authority relate, but locate the line between them, and the degree of independence each grants the state, quite differently from one another.