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Kant argues that the “discipline” of reason holds us to public argument and reflective thought. When we speak the language of reasoned judgment, Kant maintains, we “speak with a universal voice,” expecting and claiming the assent of all other rational beings. This language carries with it a discipline requiring us to submit our judgments to the forum of our rational peers. Remarkably, Kant does not restrict this thought to the realm of politics, but rather treats politics as the model for reason's authority in all the provinces that rational beings inhabit.
Gerald J. Postema (Sun,) studied this question.