I hope that in LSD Psychotherapy I will be able to convey my deep regret that, due to a complex set of circumstances, psychology and psychiatry have been deprived of this unique research tool and a powerful therapeutic tool. I believe that it is very important to clarify disputes and misunderstandings , which will give hope for possible continuation of LSD research in the future or bring closure to this remarkable chapter in the history of psychiatry. The effectiveness and safety of psychedelic substances has been tested for centuries and even millennia. It is likely that in the future we will return to research in this area, armed with the lessons of the past. But even if this does not happen, the already accumulated material has enormous theoretical significance and heuristic value. Stanislav Grof