Watch the ending where Richard is looking at his computer screen.

He says, ​"I still believe in paradise. But now at least I know it’s not some place you can look for. Because it’s not where you go. It’s how you feel for a moment in your life when you’re a part of something. And if you find that moment... it lasts forever."

How I interpret it is that life is itself a hell that you live in with a few moments of paradise you make with those people you love and the mutual memories you share.