Exodus 31:13, 17
Surely My Sabbaths you shall keep, for it is a sign between Me and you throughout your generations, that you may know that I am the LORD who sanctifies you....
It is a sign between Me and the children of Israel forever; for in six days the LORD made the heavens and the earth, and on the seventh day He rested and was refreshed."
God gives us signs of His relationship with us, His grace to us in Christ, and of our calling. One sign was Sabbath, to show the work, rest and holiness he made us for. We learn right off in this text that it is the Lord who sanctifies us. We think we sanctify ourselves by all our hard work and effort and self denial. But God sovereignly saves.
We have a poor track record of resting in God, and the punishment for that is death. That's what leads us to the grace of this table. Here Jesus died to pay for your selfish striving, your reliance on your own work, your neglect of God and family for your work, or for your rest. It's paid for.
And He is determined not to let your sin ruin His rest.
So enter the rest Jesus has prepared for you. Look to Jesus, the author and finisher notice, of your faith, who for the joy set before him, endured the cross, despising its shame, and has sat down at the right hand of God. Sit down with Jesus now. Seek his face. Rejoice in Him.