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The Ontological Argument (The Introduction)

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To help support this ministry click here: http://www.patreon.com/inspiringphilosophy Alvin Plantinga's Modal Ontological's Argument is a irrefutable logical argument for the existence of God. Yet many people seem to have a hard time understanding it. This video tries to simply the argument so the average person can understand it using Craig's work.

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Maximal greatness means maximal excellence in every possible world

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Maximal greatness means maximal excellence in every possible world

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Possesses all qualities that are better to have (such as necessity), defined as Great Making Properties, e.g love, wisdom and power which are all to their maximum capabilities (benevolence, omniscience and omnipotence) with no imperfection or corruption (Lesser Making Properties)

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Hypothetical situation to test whether an idea is logically viable to exist in a world like our own

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P1: It is possible God exists
P2: Therefore God exists in all possible worlds
P3: If God exists in all possible worlds then God exists in the actual world
Conclusion: God exists

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Contigent beings can't live in all possible worlds but a necessary being can.

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P1: It is possible that there is a being (God) that has maximal greatness.
P2: Therefore, possibly, it is necessarily true that this being exists
P3: Therefore, it is necessarily true that this being exists.
Conclusion: This being (God) exists.

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He is maximally great and is a necessary entity.

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Necessary Entity - something that cannot be false or fall to exist in any possible world. 

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Necessary Entity - something that cannot be false or fall to exist in any possible world. 

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Therefore necessarily it has to exist in all possible worlds

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P1: God is either a necessary being or is not.
P2: It is not the case God does not necessarily exist.
P3: God has a necessary existence.
Conclusion: God exists

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Plantinga differs between a being's excellence and its greatness, with its excellence relying upon its properties in one particular world, while its greatness relies upon its properties in all worlds.

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The argument uses S5 modal logic, which is one of the oldest systems of modal logic, and is the most basic.

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Defence of religious belief is foundational (does not require external justification)

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As a result, God is a necessary being, should he exist so must exist in every possible world. Therefore God exists in this one.

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1932-
American analytic philosopher
Wrote books such as "God and Other Minds" (1967) and "The Nature of Necessity" (1974)
Expressed a modal logic version of the Ontological Argument
Criticised Malcom's version of the Ontological Argument

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Logic of possibility (there is a possible world in which it is credible) and necessity (in every possible word).

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Favours world analysis of possibility and necessity: Possible worlds are how the world may have been. Therefore any logically viable world conception is a 'possible world'.

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American analytic philosopher and theologian.

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American analytic philosopher and theologian.

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Born November 15th 1932 in Michangan. Christian (former president of the Society of the Christian Philosophers). Educated at Yale University and Professor of Philosophy at the University of Notre Dame