If you actually look at the etymology of the word 'hallucination', what it's come to mean in English is a delusion. But what it really means in the original language is to wander in the mind. That's the meaning of 'hallucination', to wander in the mind.
Terence McKennaThe shaman is not merely a sick man, or a madman; he is a sick man who has healed himself.
Terence McKennaThis is a general comment that you should take a committed dose of whatever it is you're taking so that there is no ambiguity, because there's nothing worse than a sub-threshold psychedelic experience.
Terence McKennaThe problem is we have to transcend cultural languages and fall into a phase with the communication systems that nature has placed all around us.
Terence McKenna