The Catechism in Questions & Answers

312. What does the Second Commandment mean for us today?

We are to keep all things that have to do with God and His name holy. This applies to our thoughts, speech, and conduct of life.
As Christians we are especially committed to the name of the Lord Jesus Christ. As children of God, who bear the name of the Father and the Son, we have a great responsibility to keep the name of God holy.