Who said "Compassion is a weakness exploited by the strong."?

This quote is attributed to Loki Laufeyson.

Compassion is a weakness exploited by the strong. - Loki Laufeyson

"Compassion is a weakness exploited by the strong."

Loki Laufeyson Strength

"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."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."