Tribalism is a social form which can exist at any level of technology. It's a complete illusion to associate it with low levels of technology. It is probably, in fact, a form of social organization second only to the family in its ability to endure.
Terence McKennaAt still higher doses psilocybin triggers this activity in the language-forming capacity of the brain that manifests as song and vision. Psilocybin may have synergized the emergence of higher forms of psychic organization out of primitive protohuman animals. It can be seen as a kind of evolutionary enzyme, or evolutionary catalyst.
Terence McKennaOnce you get to this place on what we might metaphorically call your spiritual quest, once you get to the place where you hear about psychedelics, the issue is no longer then about where is the gas peddle on the spiritual vehicle. The issue suddenly becomes, where is the brake? Because this is the fuel to go where you want to go. This is the power to lift you where you want to be lifted.
Terence McKenna