Demons are of many kinds

It is no great accomplishment to hear a voice in the head. The accomplishment is to make sure it is telling the truth, because the demons are of many kinds: "Some are made of ions, some of mind; the ones of ketamine, you'll find, stutter often and are blind." The reaction to these voices is not to kneel in genuflection before a god, because then one will be like Dorothy in her first encounter with Oz. There is no dignity in the universe unless we meet these things on our feet, and that means having an I/Thou relationship. One say to the Other: "You say you are omniscient, omnipresent, or you say you are from Zeta Reticuli. You're long on talk, but what can you show me?" Magicians, people who invoke these things, have always understood that one must go into such encounters with one's wits about oneself.

Terence McKenna from Tryptamine Hallucinogens and Consciousness>>