And what is shamanism but philosophy with a hands-on attitude. Philosophy not made around the camp fire, but philosophy based on the acquisition of extreme experience. That's how you figure out what the world is, not by bicycling around in the burbs, but by forcing extreme experience.
Terence McKennaBasically, for me the psychedelic experience was the path to revelation. It actually worked on somebody who thought nothing would work.
Terence McKennaNature and the imagination seem to be the precursors to involvement in the psychedelic experience.
Terence McKenna