Cosmological argument: arguments

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  • Arguments
    • Leibniz' principle of sufficient reason
      • 'There must be a sufficient reason or cause explaining why things are as they are and not otherwise.'
    • Thomas Aquinas
      • Aquinas' argument from motion (1st Way)
        • 1. in the universe there are things in motion or change
        • 2. nothing can move or change itself
          • in Plato's terms everything is a secondary mover
        • 3. imagine if everything were a secondary mover - there would be an infinite regress of movers
        • 4. (Reductio ad absurdum)
          • if 3 were true then there would be no prime mover and hence no subsequent movers. but this is false
        • 5. conclusion: there must be an unmoved prime mover whom we call God
          • the source of all motion / change
      • Aquinas' argument from causation (2nd Way)
        • 1. in the universe, we find things which are caused to exist
        • 2. nothing can cause itself to exist
        • 3. imagine everything were caused to exist - there would be an infinite regress of causes
        • 4. (Reductio ad absurdum)
          • if 3 were true then there would be no first cause and hence no subsequent causes
        • 5. conclusion: there must be an uncaused first cause whom we call God
          • the source of all causation
      • Aquinas' argument from contingency (3rd Way)
        • 1. there are beings in the universe which are contingent
        • 2. if everything were contingent then there was a time when everything ceased to exist and there was nothing
        • 3. since nothing can come from nothing, there would not be anything new
        • 4. however, since this is not the case, there must be a necessary being which continued to exist
        • 5. either this necessary being has cause in itself or has its cause out of itself
        • 6. if it has its cause out of itself, the cause of that necessary being may be in or out of itself
        • 7. this cannot go back for infinity
        • therefore there must be one necessary being which sustains existence of all other beings
    • Descartes' cosmological argument
      • 1. both my idea of God and my continuing existence need explaining
      • 2. I cannot be the cause of my idea of God as I am finite and an imperfect being
      • 3. therefore the cause of my ideas of God (as a perfect being) must lit outside of myself
      • 4. I cannot bring about my continuing existence as I am contingent
      • 5. therefore my idea of God and my continuing existence must lay outside of myself
      • 6. the chain of my cause and effect cannot go back for eternity
      • 7. therefore the ultimate cause of my idea of God and my continuing existence must be perfect
      • 8. the cause is God

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