This lecture discusses the medieval Christian thinker, monk, and bishop, Anselm of Canterbury's work, the Proslogion, and focuses on his discussion in chapters 3 and 4 of the being of God, which Anselm has argued in chapter 2 can be demonstrated , beginning from the formula "that that which nothing greater can be thought" (quo maius cogitari non potest). In chapter 3, Anselm further argues that God cannot be thought not to exist, which then raises a question about how the Biblical Fool is able to say in his heart that there is no God. This is resolved in chapter 4, where Anselm makes a distinction between two modes of "thinking" 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