Who said "One cannot serve others while serving only oneself."?

This quote is attributed to Shang.

One cannot serve others while serving only oneself. - Shang

"One cannot serve others while serving only oneself."

Shang Work

"A man doesn't speak unless he has something to say."

"I need a man who can act like a woman."

"You fight good."

"Prepare yourself. The Huns have invaded China."

"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."