"One has to recognize that science is not metaphysics, and certainly not mysticism; it can never bring us the illumination and the satisfaction experienced by one enraptured in ecstasy. Science is sobriety and clarity of conception, not intoxicated vision."

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And that we cannot go to space with our feet in the mud. Nor can we in fact turn ourselves into an eco-sensitive hallucinogenic-based culture on Earth unless we fuse these dichotomous opposites. It is only in a coincidencia oppositorum, a union of opposites, that does not strive for closure, that we are going to find cultural sanity. And this is the thing that the entheogens, the hallucinogens, deliver with such clarity and regularity. They raise paradox to a level of intensity that no one can evade.

— Terence McKenna