This was the person, before man had science, whose job it was to get fucked up, usually on some form of psychedelic. But this wasn’t frivolous – it served a purpose for human evolution.
The purpose was this: by altering their consciousness, these Shamen were increasing the likelihood that they might discover an answer to whatever question was being asked, because they were scrambling their brain and seeing things from a completely different perspective.
Their breaking free from the constraints of status quo thinking allowed them look a the problem from novel viewpoints.
So psychedelics have assisted humans from the beginning of our species, as a tool to accelerate innovation.
Because that’s what humans do – we innovate.