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'Kant published the Critique of Pure Reason in 1781. It is very long and almost unreadable due to its dry prose and complex terminology. Kant tried to ease his readers’ confusion by publishing the Prolegomena to Any Future Metaphysics two years later. While it is hardly a page-turner, the Prolegomena is much briefer than the Critique and much more accessible in style, making it a valuable entry point to Kant’s metaphysics and epistemology.
Kant’s primary aim is to determine the limits and scope of pure reason. That is, he wants to know what reason alone can determine without the help of the senses or any other faculties. Metaphysicians make grand claims about the nature of reality based on pure reason alone, but these claims often conflict with one another. Furthermore, Kant is prompted by Hume’s skepticism to doubt the very possibility of metaphysics.
Kant draws two important distinctions: between a priori and a posteriori knowledge and between analytic and synthetic judgments. A posteriori knowledge is the particular knowledge we gain from experience, and a priori knowledge is the necessary and universal knowledge we have independent of experience, such as our knowledge of mathematics. In an analytic judgment, the concept in the predicate is contained in the concept in the subject, as, for instance, in the judgment, “a bachelor is an unmarried man.” (In this context,predicate refers to whatever is being said about the subject of the sentence—for instance, “is an unmarried man.”) In a synthetic judgment, the predicate concept contains information not contained in the subject concept, and so a synthetic judgment is informative rather than just definitional. Typically, we associate a posteriori knowledge with synthetic judgments and a priori knowledge with analytic judgments. For instance, the judgment “all swans are white” is synthetic because whiteness is not a part of the concept of “swan” (a black swan would still be a swan even though it isn’t white), but it is also a posteriori because we can only find out if all swans are white from experience.'