Who said "I learned that true strength comes from within."?

This quote is attributed to Maria Callas.

I learned that true strength comes from within. - Maria Callas

"I learned that true strength comes from within."

Maria Callas Strength

Opera Soprano Greek-American 1923–1977

"You have to fight to reach your dream. You have to sacrifice and work hard for it."

"If music is the food of love, play on."

"I am my own sanctuary and I can be reborn as many times as I choose throughout my life."

"The mission of an artist is to save the soul of mankind."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."