To my mind this is what shamanic training must really be, is mnemonic training. If you want to bring the stuff back you have to train yourself to bring it back.
Terence McKennaSometime in the last 50,000 years, before 12,000 years ago, a kind of paradise came into existence. A situation in which men and women, parents and children, people and animals, human institutions and the land all were in dynamic balance and not in any primitive sense at all. Language was fully developed, poetry may have been at its climax, dance, magic, poetics, altruism, philosophy. There's no reason to think that these things were not practiced as adroitly as we practice them today and it was under the boundary dissolving influence of psilocybin.
Terence McKennaThe thing is that it is incredibly frustrating to anyone who would control it, because you can't predict the impact of any technology before you put it in place.
Terence McKenna