Who said "One must be willing to be alone to truly know oneself."?

This quote is attributed to Maria Callas.

One must be willing to be alone to truly know oneself. - Maria Callas

"One must be willing to be alone to truly know oneself."

Maria Callas Solitude

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."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."