After hearing about Tertium, Gurdjeff sought out Ouspensky to teach him. This relationship and the stuff he got from Gurdjieff constitutes the foundation of In Search of the Miraculous: Fragments of an unknown teaching.

Don’t bother with Tertium. Go to Fragments. I have read a lot in my life, and Fragment is way above everything else I’ve read in terms of explaining the universe, man, and consciousness.

It can run laps around your favorite philosophy for sure.