Who said "I have always believed in the power of hard work."?

This quote is attributed to Joan Sutherland.

I have always believed in the power of hard work. - Joan Sutherland

"I have always believed in the power of hard work."

Joan Sutherland Work

Opera Soprano Australian 1926–2010

"I am just a girl who loves to sing and to share that gift with others."

"The voice is a muscle that needs to be trained and respected."

"You must always strive for perfection, but you must never believe that you can achieve it."

"Hard work is the price of success."

"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."