Who said "Your fear of death is the only rational thing about you."?

This quote is attributed to Grim.

Your fear of death is the only rational thing about you. - Grim

"Your fear of death is the only rational thing about you."

Grim Fear

"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."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."