Aquinas' Critique of Anselm's Ontological Argument
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Critique of Anselm's Ontological Argument
St. Thomas' Rejection of the Argument
St. Thomas, consistent with his realism, cannot accept an argument like the ontological argument, which derives God's existence from His essence alone.
Formulation of the Ontological Argument (AO)
Indeed, the AO can be formulated as a syllogism whose premises are:
- Major premise: God is perfect.
- Minor premise: Existence is a perfection.
- Conclusion: God exists.
Knowledge of God's Essence
St. John of Damascus would have raised the difficulty about rationally proving God's existence from His essence, because regarding God, we only have negative knowledge ("In God, one only knows what is not"). One cannot prove the existence of a substance that is unknown.