Think, Tap-Dance, God

Descartes's a priori argument that God exists is a version of what's called the Ontological Argument. The Stanford Encyclopedia of Philosophy has an entry on Ontological Arguments. They all have that weird structure:

The idea of God exists in my mind.
[fancy philosophical tap-dancing.]
Therefore, God must really exist.

Most seem to think the problem with the argument occurs somewhere around the tap-dancing.

Link to the Future

Over the next two weeks we'll be going over the debate between rationalists and empiricists. Here's an advanced survey article on the debate from my favorite free online philosophy encyclopedia:

Stanford Encyclopedia of Philosophy: Rationalism vs. Empiricism

Yes, there are more than one free online philosophy encyclopedias.