Descartes is most closely associated with the ontological argument, which he presented in his work "Meditations on First Philosophy".

The basic structure of the ontological argument is that if God is the greatest possible being, then God must exist.

The main criticism of the ontological argument is that it is circular, meaning that it assumes the conclusion in order to prove it.

Leibniz developed the modal version of the ontological argument, which argues that God's existence is necessary.

The main difference between the cosmological and ontological arguments for the existence of God is that the cosmological argument starts from the existence of the universe, while the ontological argument starts from the concept of God.

Kant argued that the ontological argument is a "proof by contradiction", meaning that it shows that the opposite of the conclusion is impossible.

The main objection to the modal version of the ontological argument is that it is too abstract, meaning that it is not based on any empirical evidence.

Kant developed the transcendental version of the ontological argument, which argues that the existence of God is a necessary condition for the possibility of experience.

The main difference between the ontological and teleological arguments for the existence of God is that the ontological argument starts from the concept of God, while the teleological argument starts from the order and design of the universe.

Anselm of Canterbury argued that the ontological argument is a "proof by analogy", meaning that it shows that the existence of God is similar to the existence of other things that we know to exist.

The main objection to the transcendental version of the ontological argument is that it is based on faith, meaning that it cannot be proven by reason alone.

Leibniz developed the cosmological version of the ontological argument, which argues that the existence of God is a necessary condition for the existence of the universe.

The main difference between the ontological and moral arguments for the existence of God is that the ontological argument starts from the concept of God, while the moral argument starts from the existence of moral values.

Anselm of Canterbury argued that the ontological argument is a "proof by intuition", meaning that it is based on an immediate and self-evident truth.

The main objection to the cosmological version of the ontological argument is that it relies on a priori reasoning, meaning that it does not take into account any empirical evidence.