Laini Taylor said this quote

Vengeance ought to be spoken through gritted teeth, spittle flying, the cords of one's soul so entangled in it that you can't let it go, even if you try. If you feel it--if you really feel it--then you speak it like it's a still-beating heart clenched in your fist and there's blood running down your arm, dripping off your elbow, and you can't let go.