According to St. Anselm, what is the first premise of the ontological argument?

St. Anselm's ontological argument begins with the assertion that God is "a being greater than all that can be conceived." This premise is integral to his philosophical reasoning. Anselm posits that if we can conceive of such a being, which is defined as the greatest possible being, then this being must exist not only in our understanding but also in reality. The rationale behind this is that existing in reality is greater than existing solely in the understanding. Thus, if God is the greatest conceivable being, then He must exist in reality; otherwise, we could conceive of an even greater being that does exist.

The other statements diverge from Anselm's core argument. The premise regarding God not existing in any possible world contradicts the essence of Anselm’s claim about the necessary existence of the greatest conceivable being. The idea that God's existence is contingent upon human belief misrepresents the ontological argument's intent to establish God's existence as a necessity rather than a matter of belief. Lastly, defining God through natural properties does not align with Anselm's focus on the concept of God as the being of which nothing greater can be conceived; Anselm’s argument relies on a definition that transcends merely natural attributes, emphasizing God