The verse seems to imply that as soon as the Jews came into Israel they were to mark the sabbatical year. When in fact it was only 7 years later? It is too impress upon us that as soon as they acquire the land they had to work towards the spiritual understanding that everything that they possess belongs to God. And this is true in our day and age as well and this is true in terms of raising a family. It all must be with the intent of causing and making a Sabbath for G-d