wheel within a wheel

Something that is very complex and perhaps overly complicated. The phrase originated in the Bible. I can't figure out how to turn off this alarm system—it's really a wheel within a wheel.

Common Names:

Name	Pronounced	Usage
Kambujiya	-	Ancient Persian
Shayna	-	Yiddish
XoÁN	-	Galician
Small	[smɔ:l]
Madhuri	-	Indian, Marathi, Hindi, Telugu, Malayalam, Kannada
Avihu	-	Hebrew, Biblical Hebrew