"I cannot stress this enough: do not take powerful hallucinogens before going to a Holocaust memorial."

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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 McKenna