not sure...it's always a mystery!
i heard it this morning at a coffee shop. that's always a good start for prospective songs of the day.
after a little research i realized it has a couple of cosmic connections to my life. i remember liking it a lot when it first came out (1968). little did i know the reference to nazareth in the song was to nazareth, pa, a place i would (decades later) live for ten years. and i actually did a favor for someone when i first started staying in the e. village, taking their guitar out to the martin guitar factory in nazareth, which is alluded to in attempts to explain the song's meaning.
ps - i liked the pope's quote: "A selfish and boundless thirst for power and material prosperity leads both to the misuse of available natural resources and to the exclusion of the weak and disadvantaged," he said.