“Thus the heavens and the earth were finished, and all the host of them. And on the seventh day God finished his work that he had done, and he rested on the seventh day from all his work that he had done. So God blessed the seventh day and made it holy, because on it God rested from all his work that he had done in creation.”
This is the Biblical account of the seventh day of the world, and unlike the days before it, nothing was created, but everything was finished. The seventh day was a day of rest.
I'm not sure if you've ever thought much about what God resting might look like, but think about it for a second. What does it look like for the Creator and Sustainer of the world to rest? Does He nap? Does He sit back, chill and watch His creation unfold? Maybe He people watches. I'm not sure, but I believe that there's something to be said for even the God of the universe taking a rest and a break from creation because He knows it's good and that He created it perfect, perfect to naturally, kind of "run itself," if you will.
I feel like God rested to show us that we all need rest sometimes and that the world will be just fine on its own without our input for a day. He made the seventh day a blessing and a break from all of the work, creating and business of the other six days of the week. The seventh day is a gift.
God gave us rest and showed us rest when He didn't have to. He didn't have to take a break or show us how to take breaks. He could've kept working after He created Adam and Eve and put them to work strait away, but instead He blessed them with the command to be fruitful and multiply, while also giving them a day of rest and displaying the importance of rest by showing them that even the Creator of it all is humble enough to let the world spin and take a rest.
-Cliff
Cliff's Note: Taking rest is a symbol of humility.