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Arguments for the Existence of God: Deductive

Descartes's supremely perfect being

  • 3 things to know
  • Component 2

Overview

Descartes's central claim about existence, descartes's triangle analogy and descartes's analogy of the mountain and the valley.

What you need to know

Answer each one before you reveal it.

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Key term

What analogies does Descartes use for a property inseparable from a concept, and what do critics say they fail to show?

Evaluation

How does Descartes define God in his version of the ontological argument?

Numbers

In which work does Descartes give his ontological argument?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    How does Descartes define God in his version of the ontological argument?

    Model answer

    Descartes defines God as a supremely perfect being. Every perfection belongs to such a being by definition.

  2. 2

    In which work does Descartes give his ontological argument?

    Model answer

    Descartes gives the argument in the fifth of his Meditations on First Philosophy, published in 1641. Earlier meditations establish his criterion of clear and distinct ideas.

  3. 3

    State Descartes's central claim about existence.

    Model answer

    Existence is itself a perfection. A supremely perfect being lacking existence would be a contradiction in terms.

  4. 4

    Explain Descartes's triangle analogy.

    Model answer

    The idea of a triangle contains necessarily the property that its angles equal two right angles. Descartes says existence belongs to the idea of God in the same inseparable way.

  5. 5

    Explain Descartes's analogy of the mountain and the valley.

    Model answer

    A mountain cannot be conceived without a corresponding valley or downward slope. Descartes argues that God cannot be conceived without existence.

  6. 6

    What qualification does Descartes add to the mountain analogy?

    Model answer

    Inseparability of mountain and valley does not prove that any mountain exists. Descartes claims God is the unique case where existence belongs to the essence itself.

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