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Human Questions

What Is the Modal Ontological Argument?

The modal ontological argument uses possible worlds and necessary existence to argue for God.

Quick Answer

A modal ontological argument says that if a maximally great being is possible, then it exists necessarily; if it exists necessarily, it exists in the actual world.

ontological argumentmodal logicgod

Key Takeaways

  • ✦The disputed step is the possibility premise.
  • ✦It relies on a modal logic of possible worlds.
  • ✦Parallel arguments test whether its form proves too much.

Question

What makes the argument modal?

Quick Answer

It turns on possibility and necessity, rather than trying to define God directly into existence.

The Structure

If maximal greatness includes necessary existence, then a possible maximally great being exists in every possible world. The actual world is one possible world, so the conclusion follows.

Objections

Critics challenge whether the central possibility claim is established and whether modal axioms used by defenders are justified.

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Reviewed by ZHAIBIAN AI Editorial Review · 2026-08-23

◈Based on 1 scholarly source◈Last updated 2026-08-23
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