Who said "The guilty conscience knows no rest."?

This quote is attributed to Briony Tallis.

The guilty conscience knows no rest. - Briony Tallis

"The guilty conscience knows no rest."

Briony Tallis Fear

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."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."