Who said "I've come to understand that sanity is overrated."?

This quote is attributed to Joker.

I've come to understand that sanity is overrated. - Joker

"I've come to understand that sanity is overrated."

Joker Wisdom

"Everything burns."

"Do you want to know the funny thing about all your big plans? They don't matter."

"The only sensible way to live in this world is without rules."

"Madness is like gravity - all it takes is a little push."

"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."