Who said "I've learned that revenge clouds judgment."?

This quote is attributed to Iron Fist.

I've learned that revenge clouds judgment. - Iron Fist

"I've learned that revenge clouds judgment."

Iron Fist Truth

"I am the living weapon. I am Iron Fist."

"I've trained my entire life for this moment."

"The chi flows through all living things."

"I need to protect the innocent."

"Lucy, you got some 'splainin' to do!"

"You must always be honest with the people you love."

"Truth always comes out in the end."

"Honesty is always the best policy."