Who said "I have learned that isolation breeds strength."?

This quote is attributed to Loki Laufeyson.

I have learned that isolation breeds strength. - Loki Laufeyson

"I have learned that isolation breeds strength."

Loki Laufeyson Solitude

"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."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."