Those who will not reason, are bigots, those who cannot, are fools, and those who dare not, are slaves.

The aphorism divides failures of reason into three moral and social types: the willful refusal to think (“bigots”), the incapacity to think (“fools”), and the fearful refusal to think (“slaves”). Its force lies in treating rational inquiry not merely as an intellectual skill but as a civic virtue tied to freedom. The last clause suggests that intimidation—whether by authority, custom, or self-censorship—can make people complicit in their own unfreedom. Read this way, the line is a compact Enlightenment-style defense of independent judgment: reason is portrayed as the antidote to fanaticism, ignorance, and tyranny.