Who said "Doubt is a poison that spreads like wildfire. Root it out."?

This quote is attributed to Stannis Baratheon.

Doubt is a poison that spreads like wildfire. Root it out. - Stannis Baratheon

"Doubt is a poison that spreads like wildfire. Root it out."

Stannis Baratheon Fear

"Duty is the death of love."

"I am of the night."

"The night is dark and full of terrors."

"A king does not ask, he commands."

"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."