It was way over the heads of most people at the time, and still today. You had to be experienced.
So much has been said about the words... I think the fab never talked about them but I could be wrong.
For me, it represented a popularised presentation of a something mystical and never repeated since - must have outraged the CIA. It's all about trying to articulate the experience rather than describing it from outside - an approach that has only ever found expression in the obscure albums. I think they copped a lot of shit over this, but good old George Martin's touch made it hard to dismiss.