Who said "The real horror isn't the monsters—it's you two."?

This quote is attributed to Grim.

The real horror isn't the monsters—it's you two. - Grim

"The real horror isn't the monsters—it's you two."

Grim Courage

"I'm a creature of pure evil, and I find your optimism... disturbing."

"Foolish boy, your mortal comprehension cannot fathom my dark intentions."

"Death is my business, and business is good."

"Your pitiful existence amuses me."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."