What is next to ecstasy?
Pain.
What is next to pain?
Nothingness.
What is next to nothingness?
Hell.

Being deprived of the original harmony with nature, characteristic of the animal whose life is determined by build-in instincts, being endowed with reason and self-awareness, we cannot help experiencing our utter separateness from every other human being. In Catholic theology this state of existence, complete separateness and estrangement from each other, not bridged by love, is the definition of "Hell."