Who said "In solitude, you learn who you really are. It's not pretty."?

This quote is attributed to Frank Castle.

In solitude, you learn who you really are. It's not pretty. - Frank Castle

"In solitude, you learn who you really are. It's not pretty."

Frank Castle Solitude

"Punishment is a language they understand."

"I'm not a hero. I'm a tool, sharpened and aimed."

"The only way to stop evil is to be better at it than they are."

"Mercy is for the living. The dead don't care."

"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."