Here is what Wikipedia says....
"Crystal Blue Persuasion" is a 1969 song originally recorded by Tommy James and the Shondells and composed by Eddie Gray, Tommy James and Mike Vale.
A gentle-tempoed groove, "Crystal Blue Persuasion" was built around a prominent organ part with an understated arrangement, more akin to The Rascals' sound at the time rather than James's other efforts of the time with psychedelic rock.
It also included a melodic passages for an acoustic guitar, as well as a bass pattern, played between the bridge, and the third verse of the song.
The title of the song came to James while he was reading The Bible's Book of Revelation, according to James in a 1985 interview in Hitch magazine:
I took the title from the Book of Revelations[sic] in the Bible, reading about the New Jerusalem. The words jumped out at me, and they're not together; they're spread out over three or four verses. But it seemed to go together, it's my favorite of all my songs and one of our most requested.[1]
With an appropriate lighting scheme, the 2000s edition of Tommy James and the Shondells perform "Crystal Blue Persuasion"
However, according to James's manager, James was actually inspired by his reading of the Book of Ezekiel where it speaks of the Blue Shekinah Light which represented the presence of the Almighty God and the Books of Isaiah and Revelation where it speaks of a bright future of a brotherhood of mankind living in peace and harmony.[2]