Our young people should have this Second Commandment earnestly pressed upon them [Deut. 6:7]. They should be trained to hold this and the First Commandment in high regard. We must hold the commandment before them, and constantly teach it, so that we bring them up not only with punishment, but also in reverence and fear of God [Eph. 6:4].
This you must also know how to use God's name rightly. For when He says, "You shall not take the name of the Lord, your God, in vain," He wants us to understand at the same time that His name is to be used properly. For His name has been revealed and given to us so that it may be of constant use and profit. So it is natural to conclude that since this commandment forbids using the holy name for falsehood or wickedness, we are, on the other hand, commanded to use His name for truth and for all good, like when someone takes an oath truthfully when it is needed and it is demanded [Num. 30:2]. This commandment also applies to right teaching and to calling on His name in trouble or praising and thanking Him in prosperity, and so on. All of this is summed up and commanded in Psalm 50:15, "Call upon Me in the day of trouble; I will deliver you, and you shall glorify Me." For all this is bringing God's name into the service of truth and using it in a blessed way. In this way His name is hallowed, as we pray in the Lord's Prayer [Matt. 6:9]. (paragraphs 61,63-64)
Condensed from CONCORDIA: THE LUTHERAN CONFESSIONS, copyright 2005,2006 by Concordia Publishing House. Used by permission. All rights reserved. To purchase a copy of CONCORDIA, call 800-325-3040.