In my experience, the words "calvinist philosophy" do not tend to inspire enthusiasm in other people. But if the idea of exploring the depths of human experience is at all interesting to you, give it a chance.
A wonderfully strange fellow, Glenn Friesen, gives us a window into his life and reflections on his new site concerning Christian Nondualism. The site is a significant resource, but I must highlight the (comparatively insignificant) fact that he has two photos of Dooyeweerd here that I have wanted to post for months.
Caveat: I'm fairly certain that the term "mystical" as Friesen applies it to Dooyeweerd must not be understood as any kind of supra-creational spiritualism.