Who said "Be brave, little Meg"?

This quote is attributed to Charles Wallace Murry.

Be brave, little Meg - Charles Wallace Murry

"Be brave, little Meg"

Charles Wallace Murry Courage

Character in A Wrinkle in Time

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"Quit being smart-alecky and pay attention."

"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."