Aquinas' criticisms of the ontological argument

The ontological argument is a priori as it is not based on experience or observation, it is known prior to experience. It is not deductive as it is not probabilistic but gives a certain conclusion. It is also analytical as its truth depends on the meaning of God including something about God’s existence.

Aquinas was a philosopher who criticised this argument. This was not because he did not believe in God, because in fact he was a theist but more…