Without the general acceptance of reasonable procedures of inquiry and precepts of debate, freedom of speech cannot serve its purpose. Not everyone can speak at once, or use the same public facility at the same time for different ends. Instituting the basic liberties, just as fulfilling various desires, calls for scheduling and social organization. The requisite regulations are not to be mistaken for restrictions on the content of speech, for example, for prohibitions against arguing for certain religious, philosophical, or political doctrines, or against discussing questions of general and particular fact which are relevant in assessing the justice of the basic structure of society. The public use of our reason must be regulated, but the priority of liberty requires this to be done, so far as possible, to preserve intact the central range of application of each basic liberty.

John Rawls, The Basic Liberties and their Priority – Tanner Lecture. He cites Kant’s use of the phrase the public use of our reason, from his 1784 essay, What is Enlightenment?

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