Who said "She had never known she was capable of such strength."?

This quote is attributed to Mariam.

She had never known she was capable of such strength. - Mariam

"She had never known she was capable of such strength."

Mariam Strength

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."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."