And so the Sabbath is different from what is common or ordinary. The other six days are common, and they are given for the pursuit of the common and ordinary things of life. On the Sabbath, we should strive to avoid those mundane things that promote the making of the Sabbath into an ordinary day. The Sabbath is a day for special things—different things. If you will turn with me to Exodus 3, we will see what makes the day holy. It is not merely proclamation by God. Here we have a biblical example of how something becomes holy.
This is what makes the Sabbath holy—different. Because God was present, the ground had to be treated in a different way—with respect and with deference that one would not give to something that is common. Until God put Himself in that area, the ground where Moses saw the burning bush was no different from all the other ground that was all the way around the area. But as soon as God put His presence there, it became sacred. It became holy.
It became holy by means of a spiritual action. It is something that is not physically discerned. And it is interesting to note, right in this context (in Exodus 3:1-5), that Moses was not aware that it was holy—until God told him! So the Sabbath is a spiritual thing. Its being holy is not something that is physically discerned. It is something that had to be revealed to you. (I Corinthians 2)