Who said "A viper in the grass, that's what I am."?

This quote is attributed to Oberyn Martell.

A viper in the grass, that's what I am. - Oberyn Martell

"A viper in the grass, that's what I am."

Oberyn Martell Power

"I am the viper. When the time comes, I will strike."

"Elia of Dorne. My sister. You raped her. You murdered her children."

"I want to look the man in the eye and see the fear in his heart."

"The man who passes the sentence should swing the sword."

"Power without control is just destruction."

"Power is not about control, it's about influence"

"The world doesn't need me to be the hero. It just needs me to be dangerous."

"The claws come out when I need them to."