Archbishop Lucas offers insights on the US Catholic Catechism for Adults Chapter 27:

The Catechism starts its reflection on the Third Commandment with the scriptural meaning of the Sabbath. Exodus 20:8-11 states that the Sabbath was the seventh day on which the Lord rested after the work of the previous six days. Deuteronomy 5:12 adds that the Sabbath is a day of our renewing the covenant with God. The Sabbath is connected to creation and covenant.

God’s “rest†on the seventh day was his contemplative gaze enjoying the good of creation, especially its crown in man and woman. It was not a matter of divine inactivity, but rather the deeper “work†of contemplation and the restful act of loving us (cf. CCC, nos. 2184-2185). This is true also of ourselves. If we never stop working, when would we ever have time to contemplate and worship God and nourish a love relationship with him or with anyone else? Every human person, having been created by God, owes him worship and thanksgiving for what the Lord has done and continues to do.