LSD

"I believe with the advent of acid we discovered new way to think
and it had to do with piecing together new thoughts of mind. Why
is it that people think it's so evil? What is it about it that
there is scares people so deeply? Because they are afraid that
there is more to reality than they have ever confronted. That
there are doors that they're afraid to go in and they don't want
us to go in there either because if we go in, there we might
learn something that they don't know. And that makes us a little
out of their control."

"He's losing his mind, and feels it going!"

"You're intoduced to lsd, an' it's not like taking some other
drug for instance like marijuana or something, hm, well, you
know, it's altogether a new thing, and you actually can have a
religious experience, and, hm, and it can be even more important
than reading the bible six times or becoming a pope or something
like that, you know..."