Who said "A man who underestimates his opponent has already lost."?

This quote is attributed to Littlefinger.

A man who underestimates his opponent has already lost. - Littlefinger

"A man who underestimates his opponent has already lost."

Littlefinger Wisdom

"Chaos isn't a pit. Chaos is a ladder."

"Knowledge is power, but power without wisdom is destruction."

"The world is not kind to those who hesitate."

"A man with no debts is a man with no leverage."

"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."