All psychedelic explorers should be aware of the concept of what is called a cognitive hallucination. The is a much more insidious phenomenon. This is, quite simply, an out-and-out delusion.
Terence McKennaIf 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 psychedelic experience is simply a compressed instance of what we call understanding, so that living psychedelically is trying to live in an atmosphere of continuous unfolding of understanding, so that every day you know more and see into things with greater depth than you did before. This is a process of education.
Terence McKennaThe miracle of our predicament is not how long everything has been in place but how brief it all has been.
Terence McKenna