Ontological Argument
An argument for God's existence that proceeds a priori from the concept of God alone, without reference to the world. Anselm argued that God, being a maximally great being, must exist (existence in reality is greater than existence in thought alone). The argument attempts to deduce God's existence from His definition.
Real World
When Anselm wrote the Proslogion in 1078 at Canterbury, he claimed even an atheist who understands the phrase 'that than which nothing greater can be conceived' already has God in the understanding — and reality must follow from that concept alone.
Exam Focus
Define 'a priori' explicitly and contrast it with a posteriori arguments like the Cosmological Argument to demonstrate conceptual clarity.
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