Who said "Fear is a teacher for those willing to learn from it."?

This quote is attributed to Oberyn Martell.

Fear is a teacher for those willing to learn from it. - Oberyn Martell

"Fear is a teacher for those willing to learn from it."

Oberyn Martell Fear

"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."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."