Who said "Relationships are where we're most vulnerable."?

This quote is attributed to Arrow.

Relationships are where we're most vulnerable. - Arrow

"Relationships are where we're most vulnerable."

Arrow Relationships

"My name is Oliver Queen. After five years in hell, I have come home with only one goal: to save my city."

"I'm not the man I was."

"You have failed this city."

"I'm a monster."

"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."