Imagine what the first Shabbos was like, after G-d created the heavens and earth. A project like none other that existed at that time; a project that will only be given a complete renewal upon the appearance of the new heavens and the new earth (Isaiah 65:17). Abraham Heschel explains that when we observe Shabbos, we are celebrating the creation of the world, to the extent that we may even take part in the renewal of the seventh day. Perhaps, this may be envisioned as actually entering that space that Heschel refers to as “an island in time.”
In parashas Mishpatim, a reminder to keep the Sabbath is given, immediately following the commandment about the Shemitah year. The juxtaposition of this reminder with the commandment in regard to the Shemitah cycle is important: what is the implication? The seventh year when the land is permitted to lie fallow, follows six years of work on the land. This cycle is akin to the day of rest that follows a six day work week. Both of these observances point towards the Millennial Sabbath, that follows six thousand years of history.
In like manner that during the first six years of the Shemitah cycle, the land is sown, and produce is gathered, the same may be true in regard to the six thousand years of history. G-d’s divine plan is continuously sown through His words, and hashgacha (guidance). The Shemitah year may be likened to the abundance of blessings that will be poured out upon us, when we are gathered into the land of Israel. The Sabbath also points towards these blessings, inasmuch that chazal explain we can even get a glimpse of Olam Haba (the World to Come) on Shabbos.