It's possible to see the whole human growth movement of the 1970s as a wish to continue the inward quest without having to put yourself on the line in the way you had to when you took 250 gamma of LSD. And I think all these other methods are efficacious, but I think it's the sheer power of the hallucinogens that puts people off.
Terence McKennaThe reason for the emphasis on shamanism and on other techniques is, you will need techniques if you go into the deep water. And they can make your life very simple and save you from unnecessary suffering. Not all suffering is necessary. Maybe no suffering is necessary.
Terence McKennaBecause this is the world that science built, with the henchmen of capitalism and Christianity.
Terence McKenna