Plantinga

• Modal ontological argument
• Possible propositions

  • logically possible
  • If proposition is not logically impossible then its possible even if its not true
• Necessary propositions

  • Must be true, cannot be false
  • E.g math equations (2+2=4)
• Contingent propositions

  • could be true and could be false
  • deal with everyday physical objects and events because they're contingent
  • e.g Obama being president is true but could have been false- contingently true
• God as a necessary entity

  • God is the greatest conceivable being
  • If God is contingent then God has a creator which is nonsensical
  • Asking who made God is like asking who is greater than the greatest conceivable being
  • If God exists he is necessary
• Modal ontological argument

  1. It is possible that God exists- The concept of God does not contain any logical absurdities
  2. If it is possible that God exists then it is possible he exists in some possible world
  3. If God exists in some possible world, then God exists in all possible worlds- God is necessary and has to be true in all possible worlds
  4. If God exists in all possible worlds then he exists in this real world
  5. Therefore God exists
• Argument relies purely on possibility