Who said "The path of a warrior is long and often lonely."?

This quote is attributed to Thor (Age of Ultron).

The path of a warrior is long and often lonely. - Thor (Age of Ultron)

"The path of a warrior is long and often lonely."

Thor (Age of Ultron) Solitude

"I am mighty, but I am not all-powerful. This is a lesson I continue to learn."

"A warrior's strength comes not just from muscles, but from the heart that drives them."

"We are stronger together than we could ever be apart."

"The best of us must sometimes make the hardest choices."

"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."