<P> John Lennon wrote the song in January 1966 , with lyrics adapted from the book The Psychedelic Experience : A Manual Based on the Tibetan Book of the Dead by Timothy Leary , Richard Alpert , and Ralph Metzner , which was in turn adapted from the Tibetan Book of the Dead . Although Peter Brown believed that Lennon 's source for the lyrics was the Tibetan Book of the Dead itself , which , he said , Lennon had read whilst under the influence of LSD , George Harrison later stated that the idea for the lyrics came from Leary , Alpert , and Metzner 's book ; Paul McCartney confirmed this , stating that when he and Lennon visited the newly opened Indica bookshop , Lennon had been looking for a copy of The Portable Nietzsche and found a copy of The Psychedelic Experience that contained the lines : `` Whenever in doubt , turn off your mind , relax , float downstream '' . </P>
where did john lennon get lyrics for the revolutionary tomorrow never knows track from revolver
The Psychedelic Experience : A Manual Based on the Tibetan Book of the Dead by Timothy Leary , Richard Alpert , and Ralph Metzner