Roman Catechism 25.14

Chapter 25 — Part III: The Decalogue — The Second Commandment

Section 14. Oaths — Finally, we honour the name of God when we solemnly call upon Him to witness the truth of what we assert This mode of honouring God's name differs much from those already- enumerated Those means are in their own nature so good, so desirable, that our days and nights could not be more happily or more holily spent than in such practices of piety I will bless the Lord at all times, says David, his praise shall be always in my mouth. On the other hand, although oaths are in themselves good, their frequent use is by no means praiseworthy.