Who said "There is something I must do."?

This quote is attributed to Mariam.

There is something I must do. - Mariam

"There is something I must do."

Mariam Courage

Character in A Thousand Splendid Suns

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"I am the gray now."

"A woman's lies of kindness are better than the truth of cruelty."

"Some people are not worth sacrificing for."

"I am this, and I am okay with that."

"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."