Remember the sabbath day, to keep it holy.
But the seventh day is the sabbath of the LORD thy God:
For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
Exodus 20:8, 10,11
"Notice that we are to remember the Sabbath day, to keep it holy. 
---It is holy, and so we are to keep it.
---We are not to make it holy, for that would be impossible; only God could do that.
*No act of ours can add to or detract from its holiness.
---Neither are we to make ourselves holy, so that we may keep it properly.
---That we could not do. But the same power that sanctified the Sabbath day will sanctify us.
---That power is the power that made the universe.
---It is creative power by which we are to be sanctified, for Christ is the Creator, and He is made unto us wisdom, and righteousness, and sanctification, and redemption.
God has given us the Sabbath, - the memorial of His creative power, - that we may know that He is the God that sanctifies us."
E.J. Waggoner