Who said "I stand for what is right, even when standing alone."?

This quote is attributed to Lady Sif.

I stand for what is right, even when standing alone. - Lady Sif

"I stand for what is right, even when standing alone."

Lady Sif

"I am a warrior of Asgard, and I will not falter in the face of darkness."

"Strength is not measured by the power of one's blade, but by the resolve of one's heart."

"A true friend stands beside you, not behind you."

"We are forged in battle, but refined through compassion."