Sylvia Plath said this quote

The human mind is so limited it can only build an arbitrary heaven — and usually the physical comforts they endow it with are naively the kind that can be perceived as we humans perceive — nothing more. No: perhaps I will awake to find myself burning in hell. I think not. I think I will be snuffed out. Black is sleep; black is a fainting spell; and black is death, with no light, no waking.