Who said "Death is the only truth in this world."?

This quote is attributed to Grim.

Death is the only truth in this world. - Grim

"Death is the only truth in this world."

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."