Who said "I learned early that mercy is a luxury."?

This quote is attributed to O-Ren Ishii.

I learned early that mercy is a luxury. - O-Ren Ishii

"I learned early that mercy is a luxury."

O-Ren Ishii Wisdom

"I am a woman, and I am a warrior. Never forget that distinction."

"The past is a ghost that haunts the present. Master it, or it will master you."

"Patience is not weakness—it is the hallmark of a true strategist."

"I have built my empire from nothing but will and intelligence."

"I'm not angry, I'm just disappointed."

"The best things in life are free."

"You can't have everything in life, but you can have what matters most."

"A woman's intuition is rarely wrong."