Introduction
Project
David Hume became skeptical of any metaphysical knowledge, any knowledge of the nature of reality. All we know is appearances, phenomenon, and beyond that it’s a matter of best beliefs. In the light of Hume’s metaphysical skepticism, Kant defines his project as the Prolegomena to Any Future Metaphysics, that is to say, what are the prospects for metaphysics. He is explicit about that orientation, in the introduction in the Prolegomena. Since the Essays from Locke and Leibniz, nothing has ever happened could be more decisive to it’s fate, than the attack made on by David Hume, he threw no light on species of knowledge, but he certainly struck a spark by which the light might have been kindled had it caught some inflammable substance had it’s fire had been carefully nursed and developed. Hume started from a single but important concept, namely that of the connection between cause and effect. He challenged reason to answer him by what right he thinks anything could be constituted that if that thing is positive something else must necessarily be positive. Hume suffers misfortunes of metaphysicians of not being understood. The question is not whether the concept of cause is right or useful, but whether that concept could thought by reason a-priori independent of experience. Metaphysics consists all sorts of concepts a-priori. Metaphysics is properly concerned with synthetic a-priori propositions. All metaphysicians are therefore legally suspended from their occupations until they adequately answered the question how are synthetic a-priori propositions are possible, for the answer contains the only credentials they must show when there are anything to offer in the name of pure reason, but if they do not possess these credentials, they can expect nothing else from reasonable people, who have been deceived so often then to be dismissed from their occupation without future inquiry. He recognizes in light of Hume’s skepticism, the very possibility of doing metaphysics is a serious question.