Who said "Regret was a burden that never lightened."?

This quote is attributed to Briony Tallis.

Regret was a burden that never lightened. - Briony Tallis

"Regret was a burden that never lightened."

Briony Tallis Perseverance

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."

"Perseverance is the key to success."

"Don't give up on what you believe in."

"I've been through worse."

"You learn to live with the pain."