Who said "Cruelty is often mercy in disguise."?

This quote is attributed to Stannis Baratheon.

Cruelty is often mercy in disguise. - Stannis Baratheon

"Cruelty is often mercy in disguise."

Stannis Baratheon Justice

"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."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."