Rav Kook, Shabbat Ha'Aretz
What the Sabbath achieves regarding the individual, the Shmita achieves with regards to the nation as a whole. A year of solemn rest is essential for both the nation and the land, a year of peace and quiet without oppressor and tyrant...It is a year of equality and rest, in which the soul reaches towards divine justice, towards God who sustains the living creatures with loving kindness. There is no private property and no punctilious privilege but the peace of God reigns over all in which there is breath of life. Sanctity is not profaned by the exercise of private acquisitiveness over all this year's produce, and the covetousness of wealth stirred up by commerce is forgotten. For food-but not for commerce.