| The Sh'mitah year, is the seventh year, in which the Torah instructs us to let the land lie fallow. One who trusts in HaShem without question, does not worry that he will lack food. He does not need to see a surplus harvest in the sixth year in order to believe that HaShem will take care of him in the seventh year. He is confident that if he fulfills the Mizvah of Sh'mittah, HaShem will provide for him. In light of his absolute trust, HaShem blesses the food that he consumes in the seventh year. Even if he eats a small amount of food, he will feel as satisfied and content, as if he ate a banquet!
The observance of the Sh'mittah year strengthens our trust in HaShem. The more we rely on HaShem to sustain us -- without ourselves doing any action to produce food -- the more HaShem will grant us miraculous and abundant blessings!
Envision a Jewish farmer saying Tehillim in the sixth year in order to strengthen his faith in HaShem. He leaves his land fallow in the seventh year with the confidence that HaShem will provide his sustenance. See his family sitting around their modest table in the Sh"mittah year enjoying a good meal with their hearts full of thankfulness to HaShem. (Based on the commentary of the Magid M'Dubno as cited in Darchei Mussar) | 
