The cross conveys to us the knowledge of God, because it shows us His power as Creator. Through the cross we are crucified unto the world, and the world unto us; that is, by the cross we are sanctified. But sanctification is the work of God, not of man. Only His divine power can accomplish the great work. In the beginning God sanctified the Sabbath, as the crown of His creative work—the evidence that His work was finished, the seal of perfection, and therefore He says, "Moreover also I gave them My Sabbaths, to be a sign between Me and them, that they might know that I am the Lord that sanctify them." Eze. 20:12.
So we see that the Sabbath—the seventh day—is the true sign of the cross. It is the memorial of creation, and redemption is creation,—creation through the cross. In the cross we find the complete and perfect works of God, and are clothed with them. Crucified with Christ means the utter giving up of self, acknowledging that we are nothing, and trusting absolutely in Christ. In Him we rest; in Him we find the Sabbath. The cross takes us back to the beginning, into "that which was from the beginning." The resting upon the seventh day of the week is but the sign of the fact that in the perfect work of God, as seen in creation,—in the cross,—we find rest from sin.