Who said "She understood then what she had been mourning."?

This quote is attributed to Briony Tallis.

She understood then what she had been mourning. - Briony Tallis

"She understood then what she had been mourning."

Briony Tallis Truth

Character in Atonement

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"Forgiveness was a luxury she could not afford."

"Writing was the only way to atone."

"She could not undo what she had done."

"Writing is the truth of the imagination."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."