In St. Anselm’s Ontological Argument, he believe that God exist in real world. He points out that nothing can be thought greater than God, and if God dose not exist, something exist must be greater than him which prove the existent of God. However, his argument is not sound. Things exist in our mind may not exist in real world. People understanding a thing cannot proves that people believe that thing. First, Anselm says that “if that than which a greater cannot be thought is in the understanding alone, this same thing than which a greater cannot be thought is that than which a greater can be thought”(132). He thinks God exist in real world because the greatest person cannot only exist in understanding. However, people who understand how great
