Shalom Auslander said this quote

… It was the knowing that there had been a happier time, a place of joy and peace and security, that made the sudden absence of it all so agonizing… Not the agony of what was, but the agony of what was no longer; this was the source of all life’s pain--not the fear of a hell to come, but rather the knowledge of an Eden that is no more. Hell isn't the punishment… Eden was.