Not sure if it was Geezer, Ozzy, or someone else who wrote the lyrics to "Spiral Architect" (from Sabbath Bloody Sabbath), but this is my favorite Sabbath song for many reasons. The lyrics being one of them.. An excerpt:
Watching eyes of celluloid
Tell you hoooow to live
Metaphoric motor-replay
Give, give, giiiiiiive!
Laughter kissing love is showing
meeee the waaaay
Spiral city architect
I build, yoooUUUu paaaay
Of all the things I value most of all
I look upon my earth
And feel their warmth
And know that it is good
YOU KNOW THAT I SHOULD!
EDIT: Listening just now, I think part of the reason "Spiral Architect" does it for me is because it's Sabbath doing The Who in their Sabbath way. The beginning progression is totally Who, but then Iommi's timbres start to seer and you know it's Sabbath running the show. The song shows off the best qualities of Who, Sabbath, and perhaps Rush.