Who said "Kindness is the rarest and most valuable currency."?

This quote is attributed to Auri.

Kindness is the rarest and most valuable currency. - Auri

"Kindness is the rarest and most valuable currency."

Auri Kindness

Character in The Name of the Wind

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"A good man treats his wife with respect."

"Kindness always comes back around."

"The power of a smile can change everything."

"Kindness is weakness to some. Not to me."