In 1790, nine years after the publication of the Critique of Pure Reason, Immanuel Kant, little given to controversies and controversies (not even intellectuals), will take the pen to respond to one of his most ferocious critics. Johan August Eberhard, Leibnizian philosopher and cordial enemy of the philosophical revolution proposed by Kant, had initiated a hard attack to the Kantian philosophy in the pages of Philosophisches Magazin of Halle.