Use them with care, and use ...

Use them with care, and use them with respect as to the transformations they can achieve, and you have an extraordinary research tool. Go banging about with a psychedelic drug for a Saturday night turn-on, and you can get into a really bad place, psychologically. Know what you're using, decide just why you're using it, and you can have a rich experience. They're not addictive, and they're certainly not escapist, either, but they're exceptionally valuable tools for understanding the human mind, and how it works.
 Alexander Shulgin

Quotes from the same author

The most compelling insight of that day was that this awesome recall had been brought about by a fraction of a gram of a white solid, but that in no way whatsoever could it be argued that these memories had been contained within the white solid. Everything I had recognized came from the depths of my memory and my psyche. I understood that our entire universe is contained in the mind and the spirit. We may choose not to find access to it, we may even deny its existence, but it is indeed there inside us, and there are chemicals that can catalyze its availability.
 Alexander Shulgin
There is a wealth of information built into us ... tucked away in the genetic material in every one of our cells ... without some means of access, there is no way even to begin to guess at the extent and quality of what is there. The psychedelic drugs allow exploration of this interior world, and insights into its nature.
 Alexander Shulgin
The potential of the psychedelic drugs to provide access to the interior universe, is, I believe, their most valuable property.
 Alexander Shulgin
I understood that our entire universe is contained in the mind and the spirit. We may choose not to find access to it, we may even deny its existence, but it is indeed there inside us, and there are chemicals that can analyze its availability.
 Alexander Shulgin
The world amazed me, in that I saw it as I had when I was a child. I had forgotten the beauty and the magic and the knowingness of it and me.
 Alexander Shulgin