Who said "In solitude, we hear the voice of our true self."?

This quote is attributed to Professor X.

In solitude, we hear the voice of our true self. - Professor X

"In solitude, we hear the voice of our true self."

Professor X Solitude

"Mutants. Since the discovery of their existence they have been regarded with fear and suspicion by humanity."

"We are the future, Charles, not them. They no longer matter."

"Just because someone stumbles and loses their way doesn't mean they're lost forever."

"What we have to fear is fear itself."

"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."