Who said "Heroism is not the way out. Heroism is the way in."?

This quote is attributed to Romain Rolland.

Heroism is not the way out. Heroism is the way in. - Romain Rolland

"Heroism is not the way out. Heroism is the way in."

Romain Rolland Courage

Novelist Musician French 1866–1944

"Life is a beautiful struggle."

"Art is the effort of man to express the unspoken."

"Music is the one incorporeal entrance into the higher world of knowledge."

"Love is life's blood."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."