
Deliberate provocation of mystical experience, particularly by LSD and related
hallucinogens, in contrast to spontaneous visionary experiences, entails
dangers that must not be underestimated.  Practitioners must take into
account the peculiar effects of these substances, namely their ability to
influence our consciousness, the innermost essence of our being.  The history
of LSD to date amply demonstrates the catastrophic consequences that can
ensue when its profound effect is misjudged and the substance is mistaken
for a pleasure drug.  Special internal and external advance preperations
are required; with them, an LSD experiment can become a meaningful
experience.
- Dr. Albert Hoffman, the discoverer of LSD
