Who said "Death is not the end, but a doorway."?

This quote is attributed to Sebastian.

Death is not the end, but a doorway. - Sebastian

"Death is not the end, but a doorway."

Sebastian Death

"You're under my spell, so don't try to resist me!"

"I'm not some common scoundrel!"

"Kiss the girl already!"

"The seaweed is always greener in somebody else's lake."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."