The Necessity of God’s Existence: Ontological Arguments Worth Considering
By Brian Chilton
One of the more difficult of the apologetics arguments to understand is that known as the ontological argument. The ontological argument finds root in Anselm of Canterbury’s famed declaration, “God is that, than which noting greater can be conceived.” This is the say, God is the greatest of all possible beings. God, properly understood, is maximally great. Nothing could be greater than God. Thus, Anselm argues that if it is possible to conceive of the greatest possible beings, then that greatest possible being must exist. There is much to unpack in this argument. However, I would like to focus on arguments that provide reasons to believe that God is a necessary being.
Before we look at some arguments for the necessity of God’s existence, we must first define a necessary being. A necessary being is a being whose existence is mandatory due to a result of that being’s existence (i.e., contingency). For example, I exist only because of the necessity of my parents’ existence. My existence is contingent (based upon) the necessity of their existence. My parents’ existence is contingent (based upon) the necessity of their parents’ existence (my grandparents). The logical line of necessity continues until one finds the necessity of a maximally great being—a being that is transcendent, omnipotent, omniscient, omnipresent, and omnibenevolent. We know that maximally great being as God. Let’s look at three or four modern ontological arguments that make the case for the necessity of God’s existence.
- Necessity of God Found in Logical Necessity.
As we already unpacked the argument from necessity, we have found that God’s existence is mandatory. However, the logical necessity of God’s existence is found in the following argument presented by Douglas Grootius…
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