Who said "I have stared into the abyss, and it stared back."?

This quote is attributed to Loki Laufeyson.

I have stared into the abyss, and it stared back. - Loki Laufeyson

"I have stared into the abyss, and it stared back."

Loki Laufeyson Courage

"I am Loki of Asgard, and I am burdened with glorious purpose."

"You call it madness, but I call it ambition."

"Kneel before me. I am your king."

"The chitauri will devour the weak, and put the strong to work."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."