Who said "Friendship is for those too weak to walk alone."?

This quote is attributed to Moriarty.

Friendship is for those too weak to walk alone. - Moriarty

"Friendship is for those too weak to walk alone."

Moriarty Solitude

"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."

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."