This lecture discusses key ideas from the 18th century philosopher Immanuel Kant's work, The Prolegomena to Any Future Metaphysics. Specifically it focuses on he conclusion of the third part, specifically his discussion of the boundaries (Grenzen) for reason. These limits take place where we go beyond the field of experience into the "empty space" that is the field of the noumena or things in themselves. Reason not only recognizes these limits but also imposes them upon itself and on the faculty of understanding. To support my ongoing work, go to my Patreon site - www.patreon.com/sadler If you'd like to make a direct contribution, you can do so here - www.paypal.me/ReasonIO - or at BuyMeACoffee - www.buymeacoffee.com/A4quYdWoM You can find over 3,000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Purchase Kant's Prolegomena to Any Future Metaphysics - amzn.to/49pc1Xm