Immanuel Kant Philosophy According to Kant, his reading of David Hume awakened him from his dogmatic slumber and set him on the road to becoming the “critical philosopher,” whose position can be seen as a synthesis of the Leibniz-Wolffian rationalism and the Humean skepticism. Kant termed his basic insight into the nature of knowledge “the Copernican revolution in philosophy.” Instead of assuming that our ideas, to be true, must conform to an external reality independent of our knowing, Kant proposed that objective reality is known only insofar as it conforms to the essential structure of the knowing mind. He maintained that objects of experience—phenomena —may be known, but that things lying beyond the realm of possible experience—noumena, or things-in-themselves—are unknowable, although their existence is a necessary presupposition. Phenomena that can be perceived in the pure forms of sensibility, space, and time must, if they are to be understood, possess the characteristics that constitute our categories of understanding. Those categories, which include causality and substance, are the source of the structure of
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