The song is perhaps best known for its opening lines: “Timothy Leary’s dead / No, n-n-no he’s outside looking in”, which allude to Leary’s use of eastern mysticism (most notably The Tibetan Book of the Dead) to frame the psychedelic experience.
https://github.com/davepinch/pinchy.cc/blob/master/content/topics/religion/buddhism/bardo-thodol/the-tibetan-book-of-the-dead.md
And to every beast of the earth, and to every fowl of the air, and to every thing that creepeth upon the earth, wherein there is life, I have given every green herb for meat: and it was so. Genesis 1:30 KJV