Without independent justification for S5 over weaker systems like S4 or B, Hartshorne's ontological argument begs the question by embedding the controversial inference in its modal assumptions.
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independent justification(Epistemology of justification transmission)
Justification that appears intuitively independent of the original justification for a proposition q; more precisely, transmitted justification for q that is additional and independent when three counterfactual conditions are met: the subject was already justified in believing q before acquiring the new evidence, remains justified during acquisition, and would have gained a first-time justification via transmission had no prior justification existed
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.