Who said "I've forgotten more about death than you'll ever know."?

This quote is attributed to Grim.

I've forgotten more about death than you'll ever know. - Grim

"I've forgotten more about death than you'll ever know."

Grim Death

"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."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."