Who said "True courage means standing alone when necessary."?

This quote is attributed to Sif.

True courage means standing alone when necessary. - Sif

"True courage means standing alone when necessary."

Sif Courage

"I have waited lifetimes for this moment."

"A warrior's heart beats strongest in battle."

"We are bound by more than just duty."

"The past shapes who we become."

"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."