Who said "The voice is both instrument and vehicle for the soul."?

This quote is attributed to Joan Sutherland.

The voice is both instrument and vehicle for the soul. - Joan Sutherland

"The voice is both instrument and vehicle for the soul."

Joan Sutherland

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."