Plantinga's modal ontological argument illicitly moves from the coherence of possible maximal greatness to its actualization in the actual world via S5, but S5's axiom that possible necessity entails actual necessity is not analytically guaranteed for contingent beings.

?Rate how convincing each reason is below to see the overall strength.

No one has weighed in yet. Be the first to share reasons for or against this statement.

Analytically guaranteed(what the statement says S5 is NOT): Something that must be true just by analyzing the meaning of the words, without needing extra information about how the world actually works.
Axiom(as something that may be necessary or redundant in a logical system): A basic assumption or rule that you accept as true without proof, which then serves as the foundation for building other conclusions.
Maximal greatness(what Anselm uses to define God): The quality of being the greatest or most perfect possible in every way—a key description of God in this argument.
Plantinga: Alvin Plantinga is an American philosopher best known for his work on the philosophy of religion, particularly his arguments defending religious belief as rational and reasonable. He developed influential ideas about how people can rationally believe in God without needing scientific proof, arguing that faith and reason aren't necessarily in conflict. His work has shaped modern religious philosophy and made him one of the most important Christian philosophers of the past 50 years.

Based on where you are in your exploration

Possible necessity(as one type of necessity reading in Ibn Sina's system)

Something that could be true under certain conditions or circumstances, even if it isn't always true.

S5(modal logic axiomatization)

A modal logic axiomatizable equivalently by {K,T,B,4} or by {K,T,5}, corresponding to the class of frames with equivalence relations

actualization(Modal-Hamiltonian Interpretation)

The process by which a quantum observable acquires a definite actual value, as defined by the Hamiltonian in MHI

contingent beings(Modal metaphysics)

Beings whose existence is not necessary — they exist but could have failed to exist

modal(in logic and metaphysics)

Dealing with possibility and necessity—questions about what could be true, what must be true, and what's merely contingent (could go either way).

ontological argument(Described as an early and now-canonical formulation found in Anselm's Proslogion.)

An argument that seeks to demonstrate God's existence from the concept or definition of God alone, without appeal to empirical evidence.

This idea is waiting for its first supporting or challenging perspective.