Who said "Death might be an ending, but it's not the worst thing."?

This quote is attributed to Billy.

Death might be an ending, but it's not the worst thing. - Billy

"Death might be an ending, but it's not the worst thing."

Billy Death

"I'm a big fan of science!"

"Mandy, wouldn't it be great if we could stay young forever?"

"I love the smell of destruction in the morning!"

"Why does everything have to be so complicated?"

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."