Who said "Relationships require as much effort as any battle."?

This quote is attributed to Lady Sif.

Relationships require as much effort as any battle. - Lady Sif

"Relationships require as much effort as any battle."

Lady Sif Relationships

"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."

"The key to a happy marriage is communication."

"Marriage is about compromise and understanding."

"Life's greatest treasures are relationships."

"Trust is a luxury I can't afford."