Psychedelic drugs, especially psilocybin, allow a searchlight to be thrown on these deeper levels of the psyche, as Jung correctly stated. But it is not a museum of archetypes or psychic constructs, as he seemed to assume. It is a frontier of wholeness into which any person, so motivated and so courageous as to wish to do it, can go and leave the mundane plane far behind.
Terence McKennaThe Truth doesn't need your cooperation to exist. All forms of cult, all forms of hype, all forms of delusion do require your participation in order to exist. I've looked into marginal areas of human experience -historical and otherwise- with a rational mind, and what I've found is that doorways into the miraculous are far fewer than the publicists of the New Age would have us believe. On the other hand, they are not as rare as the proponents of radical reductionism and materialism would have us believe. There are doorways out of the mundane.
Terence McKennaAnd psychedelics now, as we de-condition ourselves from the post-medieval world, they are present to hand as tools.
Terence McKenna