Roman Catechism 26.15

Chapter 26 — Part III: The Decalogue — The Third Commandment

Section 15. They are also to be taught, that from these words we may learn how we should employ our time during the week; that we are to keep constantly in view the Lord's day, on which we are, as it were, to render an account to God for our occupations and conduct; and that therefore our works should be such as not to be unacceptable in the sight of God, or, as it is written, be to us an occasion of grief, and a scruple of heart.