ויכל אלהים ביום השביעי.
דָּ"אַ מֶה הָיָה הָעוֹלָם חָסֵר? מְנוּחָה, בָּאת שַׁבָּת בָּאת מְנוּחָה, כָּלְתָה וְנִגְמְרָה הַמְּלָאכָה:
ויכל אלהים ביום השביעי AND ON THE SEVENTH DAY GOD FINISHED — Another explanation: What did the world lack? Rest! Sabbath came — Rest came; and the work was thus finished and completed (Genesis Rabbah 10:9)!
However, there is no doubt that any material object which has no aspect of spirituality in its makeup, will decay and not exist, as a person when they die, for the lack of spirituality in their soul causes it to die. For all things that God created, even though they are all material, they will not continue to exist or rest but rather they will decay daily.
With this background we can proceed. It is known that it is from the holiness of Shabbat that the flow of holiness emanated to the world, and created an additional soul in a person. When God created the earth, in that it was material as a body without a soul, it is was destined to decay and not continue in its existence. That which gave it a soul and holiness in order to continue to exist was the Shabbat, for from the Shabbat the world was infused with holiness in order to continue its existence and not decay. This implies that the world was lacking rest. Shabbat came and infused holiness in everything that was created, and that holiness was to the world as a soul in a body. This is what the Torah says “God ceased (shabat) and caught God’s breath (vayinafash)” for God ceased (i.e. made Shabbat) and gave the world a soul / nefesh to sustain it. This is what is said “Sabbath came, rest came.” For without this there would not have been rest and sustainability for the world.