Who said "The past is the past"?

This quote is attributed to Arya Stark.

The past is the past - Arya Stark

"The past is the past"

Arya Stark Change

Character in A Storm of Swords

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"All men must die"

"A girl has a name"

"I am no one."

"Fear cuts deeper than swords."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."