Master Po: Did your eye meet your own fist?
Young Caine: Then shall I seek ways to repay?
Master Po: What is the debt?
Young Caine: My suffering.
Master Po: Vengeance is a water vessel with a hole. It carries nothing but the promise of emptiness.
Young Caine: Shall I then repay injury always with kindness?
Master Po: Repay injury with justice and forgiveness, but kindness always with kindness

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Kung Fu – Vengeance – S01E04 An Eye For An Eye – David Carradine