Who said "Solitude is where a man discovers his true strength."?

This quote is attributed to Penguin.

Solitude is where a man discovers his true strength. - Penguin

"Solitude is where a man discovers his true strength."

Penguin Solitude

"I am not a human, I am an animal. A cold-blooded animal."

"You poor, unfortunate fool."

"Life's a bitch, isn't it?"

"I've been dead once already. It's not so bad."

"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."