Psychedelic Prayers: And Other Meditations - Tapa dura

Leary believed Lsd showed therapeutic potential for use in psychiatry. He popularized catchphrases that promoted his philosophy such as "turn on, tune in, drop out" (a phrase given to Leary by Marshall McLuhan); "set and setting"; and "think for yourself and question authority". He also wrote and spoke frequently about transhumanist concepts involving space migration, intelligence increase and life extension