The Shemittah (sabbatical year) is a seven-year cycle and holds obvious parallels to the Shabbat (Sabbath) and is supposed to draw your attention to it. Man works six days and rests on the seventh. Man is made from the dirt and the dirt is supposed to rest as well. Man and dirt are one and the same. When we abuse the seven-year cycle of the land, we are abusing ourselves.
When you make the land work on its shabbat, it’s an abuse of the land, just as a man making a maid or male servant work on the seventh-day Shabbat is abuse.
The 50th-year Yobel (Jubilee) is part of the pattern of rest and release. These cycles described in the Torah reading בהר Behar (“on the mountain,” Leviticus 25) were not invented by man. We are not in the habit of resting. We are driven to work, and gather wealth. We work to live, not live to work.