Published after Critique of Pure Reason, Prolegomena to Any Future Metaphysics restates and summarizes many of the main arguments. Kant also applies what he calls an “analytic” method, with a view to making his ideas clearer. The book also argues for the importance of Critique of Pure Reason and rebuts a negative review.
“concerning the origin, not concerning the indispensable need of the concept” (Page 5)
“All metaphysicians are therefore solemnly and legally suspended from their occupations till they shall have answered in a satisfactory manner the question, ‘How are synthetic cognitions a priori possible?’ For the answer contains the only credentials which they must show when they have anything to offer in the name of pure reason. But if they do not possess these credentials, they can expect nothing else of reasonable people, who have been deceived so often, than to be dismissed without further ado.” (Page 29)
“Since the Essays of Locke and Leibnitz, or rather since the origin of metaphysics so far as we know its history, nothing has ever happened which was more decisive to its fate than the attack made upon it by David Hume.” (Page 3)
“ cause and effect was by no means the only idea by which the understanding thinks the connexion of things a priori” (Page 7)
“but whether that concept could be thought by reason a priori” (Page 5)