This lecture discusses key ideas from the medieval Christian philosopher and theologian Thomas Aquinas' Summa Theologiae, 1st part, question 27, "The Causes Of Love", and examines his discussions in articles 1 and 4, which center on the issues whether goodness in some sense is a cause of love and whether any other passion is the case of love. Aquinas' answers are that in every case, some good is the cause of love, even seemingly in the case of hatred, which presumes love as well. He also clarifies that love is at the root of all the other passions, although is specific cases, love can be also caused by a specific passion. 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 3500 philosophy videos in my main YouTube channel - www.youtube.com/user/gbisadler Purchase Thomas Aquinas' Summa Theologiae - amzn.to/2ITcKYQ