I used to play video games all the time when I was a little kid. I was utterly fascinated with all the possibilities that existed in whatever video game that I was playing at the time. Back then, my goal in every one of those video games that I played was to explore and do everything that I could possibly do before I realized that I had done everything that could have possibly done and knew that somehow, the game had to end. Despite all my efforts, I knew that no matter what I did that game ultimately needed to end, whether I liked it or not.
However, somewhere in that space between the point that I realized that I had accomplished everything in my current game and the point that it had to end, there was a certain peaceful stillness in knowing that I could go no further, and the only thing that was left for me to do was to look back at all I did, and be happy with my past accomplishments in that game.
Now that I'm a rational and fully-grown adult, I often wonder what I should be looking forward to in the absence of an afterlife, and the one thing that I truly long for is that one moment in my life where I can say that I have accomplished everything that I have wanted to do, and can go no further.
At that point, or that hour, minute, and even that one very second--I'll be able to look back at this game of life with the same stillness that I had when I was a child, and happily realize that I wouldn't change a damn thing about it.
The only (relative) heaven that I'll ever have as a human being is that one final moment of absolution that tells me it was all worth it because of what I did for others as well as what I did for myself. Indeed, there is no afterlife, but what we do with our lives ultimately determines the heaven or the hell that we will face when we have to look back at the course of our lives and ask ourselves if it was truly worth it.
In a nutshell, your life can be heaven or hell depending on your choice of actions. Which one will you choose?