Human relations are built on feeling, not on reason or knowledge. And feeling is not an exact science; like all spiritual qualities, it has the vagueness of greatness about it.
Because for me, '60s pop music is amongst the most complicated or complex music because it has so many resonances which strike you. The music itself is often simple, but the way that I interpret it, or the way I think it's interpreted culturally, is very complex.
The pain comes from knowing that we have never been safe, and therefore will never be safe again. It comes from knowing we can never be so ignorant again. It comes from knowing we can never be children again. Losing innocence. Remembering heaven. That was the essence of hell.