The third commandment: “Remember the Sabbath day to sanctify it.” Here is sanctification because here is the Spirit of God. Well, here is what a true holiday, that is to say, quietness and rest, means. Unquiet people are those who recoil from the Holy Spirit, loving quarrels, spreading slanders, keener on argument than on truth, and so in their restlessness, they do no allow the quietness of the spiritual Sabbath to enter into themselves.

–Augustine, Sermon 8.6