How to Conceive of God

When Aquinas says that you can't actually conceive of God, it's just easy wrong. This is something that Descartes had a good line on when he was talking about shapes. You can conceive of such a shape, but it doesn't mean you can kind of grasp. So just imagine, if you will, humanly, the greatest conceivable being. I've got a shag in my head. Well, I think we can improve upon Carl Sagan a little bit. That's lost me.