This lecture discusses key ideas from the 18th century philosopher Immanuel Kant's work, The Prolegomena to Any Future Metaphysics. Specifically it focuses on the "Solution of the General Problem of the Prolegomena", specifically his discussion of two common philosophical approaches that will not work for developing a genuine metaphysics, or even just producing one valid a priori synthetic proposition. One of these is appealing to probability (Wahrscheinlichkeit) or conjecture (Mutmaßung). The other is appealing to sound common sense (Menchenverstand). 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