Who said "Hope is what remains when hope is gone."?

This quote is attributed to Moriarty.

Hope is what remains when hope is gone. - Moriarty

"Hope is what remains when hope is gone."

Moriarty Hope

"You see, but you do not observe. The distinction is quite clear."

"I am not a puzzle to be solved; I am the one who solves."

"The world is full of obvious things which no one by any chance ever observes."

"Crime is common. Logic is rare."

"Every day is a new opportunity."

"Hope is what gets us through difficult times."

"I'm not your enemy, kid. I'm trying to save you."

"Redemption is a long road."