This image is in my mind… I imagine the Shabbat like the corners of the fields. God is the farmer who is in the center, the riches of the field and its harvest. He deserves all and is faithful to His work. And He, in His graciousness, left the corners of His field (His Kingdom, His rest and love) unplowed so that we, the poor and the needy might come partake of His goodness.
That is Shabbat. Be blessed and partake of the rest of the Master.