Deductive arguments: Anselm - God has necessary existence

Anselm starts Proslogion Chapter 3 by developing the theme of God as the greatest possible being:

• 'God cannot be conceived not to exist'

Once you have understood what it means for God to be the greatest possible being, then the next logical step is to conclude that God has necessary existence 

Anselm's reasoning goes something like this:

• It is possible to think of a being who has the property of having to exist (not able to not exist)
• It is also possible to think of something that does not have to exist
• The one…