John Locke’s A Letter Concerning Toleration is widely regarded as a foundational text of religious liberty. For centuries, thinkers have praised its clarity, moral confidence, and rejection of the coercive religious politics that prevailed in early modern Europe. On the surface, Locke offers a simple and powerful claim: the state has no authority over the salvation of souls, and therefore it ought not to coerce religious belief or practice.
But this framing, so often viewed as self-evident, rests on claims that are highly contestable. Locke’s case is not religiously neutral. His argument becomes far less persuasive once we interrogate his assumptions. Religious freedom is good, but Lockean toleration is too fragile to sustain it.
Locke’s argument depends on a sharp division between the civil and the spiritual. The magistrate, he says, is concerned only with outward goods: life, liberty, property. Religion, by contrast, concerns inward belief and the salvation of the soul. Because belief cannot be forced, and because the state has no power over salvation, coercion in religion is both ineffective and illegitimate.
The argument is neat, forceful, and compelling on its surface. But it sidesteps rather than engages the thorny issues surrounding religious freedom.
Of course, coercion cannot produce genuine faith. This is obvious and had been recognized long before Locke. The deeper issue is that Locke quietly redefines both religion and politics to make his conclusion seem inevitable. Religion becomes primarily inward, a matter of private conviction. The Church becomes something akin to a club, a mere gathering of like-minded individuals. Politics, meanwhile, is reduced to the management of external order.