"Is not man himself the most unsettled of all the creatures of the earth? What is this trembling sensation that is intensified with each ascending step in the natural order?"

Next Quote

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 McKenna