Who said "Work is the prayer of the dedicated"?

This quote is attributed to Led Zeppelin.

Work is the prayer of the dedicated - Led Zeppelin

"Work is the prayer of the dedicated"

Led Zeppelin Work

Rock Band British 1968–1980

"I've been dazed and confused for so long it's not true"

"The song remains the same"

"Whole lotta love is what I need"

"Black dog on my trail"

"Hard work never killed anybody."

"Work with purpose and integrity."

"Hard work pays off in the end."

"A man's gotta do what a man's gotta do."