Good vs. Evil...
If there is one, is there not the other? You can't believe in one and not the other, can you? There are two books out: Heaven is for Real is about a boy who has a out of body experience in heaven. There are also books out by people who have had an experience in hell. There is one called 23 Minutes in Hell.
It's interesting that not all people have the same near-death experiences: Some see a white light and loved ones that have gone on before but some see a lake of fire.
