This lecture discusses key ideas from the Medieval philosopher, theologian, and Dominican friar, Thomas Aquinas, and focuses on his Summa Theologiae, Prima Pars, q. 2. It focuses upon his discussion in article 2, bearing on whether God's existence can be proven or demonstrated by rational means at all. Thomas offers us five ways to argue for God's existence. The first way focuses on motion or change, and argues that God is the Prime Mover. 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 2000 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler You can find Thomas Aquinas' Summa Theologiae online here - www.newadvent.org/summa/