OCR A-Level Philosophy | Essential Videos for Exam Success - Anselm's Ontological Argument vs. Gaunilo's "Perfect Island"

👉 https://untanglephilosophy.com Can you prove God’s existence using logic alone—without any evidence? That’s exactly what St. Anselm tried to do. His ontological argument claims that God’s existence follows purely from the definition of God as “that than which nothing greater can be conceived.” Gaunilo challenged the argument with his “perfect island” objection. The ontological argument begins with defining God as “that than which nothing greater can be conceived”. St. Anselm, in the “Proslogion”, claims that if such a being exists in the understanding, it must also exist in reality—because something that exists in reality is greater than something that exists only in the mind. Therefore, by definition, God must exist. This is an a priori argument for the existence of God, relying on logic and reason rather than empirical evidence. Gaunilo challenges this line of reasoning with a reductio ad absurdum. He asks whether the same logic could prove the existence of a perfect island—something greater than which cannot be conceived in island terms. If we can imagine such an island, does it therefore exist? Anselm replies that the argument only works for a necessary being, not for contingent things like islands. God, unlike an island, is said to exist necessarily—meaning that God cannot not exist. This leads to a deeper debate about the nature of necessary existence and whether the concept of God uniquely fits that category. Anselm argues that God’s non-existence is logically impossible, because the very concept of God includes necessary existence. This is emphasised in the second part of Anselm’s argument in chapter three of the Proslogion, in which he argues God cannot even be thought not to exist. It is greater to for one’s non-existence to be inconceivable than conceivable, and therefore, God cannot be conceived not to exist. Anyone who tries must necessarily be conceiving of God in some way in turn to attempt conceiving of Him not existing. Perfect for University Courses & A-Level Philosophy & Ethics OCR & AQA or equivalent. 🔍 Key Points Covered - Anselm’s ontological argument and the idea of God as “that than which nothing greater can be conceived” - The difference between existence in the mind and existence in reality - Gaunilo’s perfect island objection as an reductio ad absurdum argument - The concept of necessary versus contingent beings - Anselm’s claim that God’s non-existence is (supposedly) inconceivable 📖 Chapters 00:00 Introduction – Can you prove God exists just by thinking? 00:16 What is the Ontological Argument? 00:51 Anselm’s Ontological Argument Explained 02:18 Gaunilo’s Perfect Island Objection 03:25 Anselm's Response: Necessary vs. Contingent Beings 04:24 Can You Conceive of God Not Existing? Anselm’s Argument Part 2 (Chapter 3 of Proslogion) 05:59 Why Gaunilo's Perfect Island Objection Fails 🔔 If you enjoyed this video, don’t forget to subscribe for more philosophy content! 👍 Like and share to help others find this video. 🗨️ Have thoughts or questions? Drop a comment below! 📷 instagram.com/untanglephilosophy 🎵 tiktok.com/@untanglephilosophy 📺 More Videos Next episode coming soon! 🔬 Sources and Further Reading Anselm of Canterbury (2008) The Major Works. Reissued edn. Edited by B. Davies & G. R. Evans. Oxford: Oxford University. Davies, B. (2004) ‘Anselm and the Ontological Argument’, in B. Davies and B. Leftow (eds) The Cambridge Campanion to Anselm. Cambridge: Cambridge University Press, pp. 157-178. Goldschmidt, T. (2020) Ontological Arguments. Cambridge: Cambridge University Press. Van Inwagen, P. (2010) ‘Ontological Arguments’, in C. Taliaferro, P. Draper, and P. L. Quinn (eds) A Companion to Philosophy of Religion. 2nd edn. Chichester, West Sussex: John Wiley & Sons, pp. 359-367. “The Youtuber from Long Ago” (whose video is much better than mine): https://www.youtube.com/watch?v=YLQ0DnUTyX8 #ontologicalargument #anselm #gaunilo #philosophyofreligion #religiousstudies #ocr #aqa Code: QJ3EWOU3MNDIKFO5