I know you’ve put Philosophy for Theologians on the back burner, but you should get Roy Clouser on to speak about Dooyeweerd, self-evident knowledge of God, and the internal testimony of the Holy Spirit:

http://www.christianmind.org/npc/wrestlers/details.asp?id=366
http://cdn.desiringgod.org/website_uploads/documents/books/god-is-the-gospel–2.pdf#71
http://www.allofliferedeemed.co.uk/clouser.htm