[Aquinasfan]

Unnecessarily long. Can be: "I. Therefore I exist." Having a concept of I proves thinking has taken place, so it is not necessary to add the argument "think."

Why not dispense with the thinking bit altogether and posit that "I exist." It's tough to refute yourself on that one.

[savedbygrace]

Since there are no givens, you have to have at least one argument before the conclusion. I think.

But I was jest havin' fun. Now you've got me thinking seriously.