St. Anselm, in his Ontological Argument, attempted to prove the necessary existence of God simply by reflecting on the concept of God. By setting up the premise “God exists only in the understanding,” and then going out to disprove this premise, St. Anselm makes a case for the necessary existence of God.
In this paper, I will first explain two of St. Anselm’s logical tools, then state his argument, and then go over each premise he makes. To conclude, I will write about Immanuel Kant’s objection to Anselm’s argument and the best response Anselm could give.
Anselm used a logical tool called Reductio Ad Absurdum (RAA) to prove his theory. RAA sets up an original premise and then sets out to disprove the original premise. Anselm uses this to perfection. His original premise dictates that God exists in the understanding. He then disproves this premise, thus proving that He exists in reality.