It is not that God from His infinite state rewards us or punishes us, or that there is one fold or enclosure called heaven, in which the virtuous are allowed to be, and another called hell, in which all the sinners are penned. In reality we experience heaven and hell in our everyday life all the time. But here we experience both states, the dream and the physical life. There is always the possibility of change. If we experience hell now, tomorrow it may be heaven. If our experience today is heaven, then there is the chance that tomorrow it may be hell. But when we return from this world of variety we do not progress in experience; our heaven and hell do not change much.