Religious Toleration: Theory and Practice

Core Idea

The devastating Wars of Religion in sixteenth and seventeenth-century Europe prompted development of toleration theory—arguments that religious plurality could coexist peacefully within a state—and practical experiments like the Edict of Nantes (1598). Early modern toleration was typically pragmatic and partial rather than principled: it aimed to prevent violence rather than celebrate diversity. Toleration developed not from enlightened principle but from exhaustion after decades of religious warfare. The concept that state authority should remain neutral toward religious differences represented a profound shift from medieval Christendom.

Explainer

If you have studied the religious wars of early modern Europe and the process of confessionalization, you know that by the late 16th century the continent had been divided into hard confessional camps — Catholic, Lutheran, Reformed — each claiming exclusive truth and, in many states, exclusive political legitimacy. The question toleration theorists faced was not abstract philosophy but urgent practical politics: how do you govern a kingdom where the king is one confession and a large minority of subjects is another?

The key insight — and it came slowly, reluctantly — was that state authority and religious truth could be separated. Medieval Christendom had assumed they were the same: the king's job was to secure his subjects' salvation, heresy was sedition, and toleration was complicity in damnation. The Edict of Nantes (1598), signed by Henri IV after the catastrophic Wars of Religion, did not celebrate religious diversity. It was a pragmatic modus vivendi — a legal framework for coexistence that still privileged Catholicism while granting Huguenots rights of worship in specified places, their own law courts, and garrison towns. What is striking is how limited it was by modern standards, and how radical it seemed at the time.

Early toleration theory developed several distinct arguments worth distinguishing. The pragmatic argument was the most common: religious coercion does not work, and trying to force faith produces only hypocrites and rebellion — better a stable realm of diverse believers than a war-torn realm of enforced uniformity. The jurisdictional argument, developed by figures like Sebastian Castellio after the execution of Michael Servetus in Geneva, held that secular rulers had no authority over conscience — only over external behavior. Later, John Locke would develop a more principled version: the church is a voluntary association, not a coercive institution, and the state's only legitimate aim is civil peace, not salvation. These arguments are importantly different: the pragmatic version tolerates only because coercion fails; the jurisdictional version holds that coercion is illegitimate regardless of its success.

What the early modern experience teaches is that toleration is a political achievement, not a natural default. The Edict of Nantes was revoked by Louis XIV in 1685, triggering renewed persecution and mass emigration of Huguenots. Religious pluralism as a stable norm required not only legal frameworks but the political exhaustion of the alternative — the recognition, hard-won across generations of warfare, that coercive religious uniformity was more costly than imperfect coexistence. The path from pragmatic modus vivendi to principled freedom of conscience is long, uneven, and repeatedly interrupted. Understanding why toleration was so difficult to establish is inseparable from understanding why it eventually became so widely accepted.