Certainly neo-Platonism, Plotinus and Porphyry and that school are psychedelic philosophers. Their idea of an ascending hierarchy of more and more rarefied states is a sophisticated presentation of the shamanic cosmology, which is the cosmology that one experientially discovers when they involve themselves with psychedelics.
Terence McKennaAnd science, when it examines psychedelics, as it will and must, is going to discover a revolution, I believe, that will put all the previous revolutions in perspective.
Terence McKennaCulture is more and more consciously becoming a project carried out in the domain of language by, for instance, propaganda both governmental and commercial.
Terence McKennaThere is not the Newtonian universe deployed throughout the parsecs and kiliocosms of physical space and the interior mental universe. They are the same thing.
Terence McKennaChaos is roving through the system and able to undo, at any point, the best laid plans.
Terence McKenna