Q. 53 Which is the third commandment?A. The third commandment is, Thou shalt not take the name of the Lord thy God in vain, for the Lord will not hold him guiltless that taketh His name in vain.What does it mean to take His name in vain? Something is done in vain when it means nothing—when it is empty, worthless, useless (Ps 

, Hos 10:4). The key ingredient required to reverence God's name is faith (Heb 11:6). The 3rd commandment tells you to have a high regard for His name.

WSC Q54: 3rd Commandment Requirements

The idea of imparting a body of truth (rudiments of the faith) is found repeatedly in scripture under many different terms and descriptions. We are not given a complete catechism or confession in the Bible. That is because we are to write our own according to the needs of the day. They must refute new heresies as they arise. Our Lord has called us to catechise in His church… to teach disciples the basics of the faith. Make the most of this instruction: memorise your Catechism, listen to the messages, and pray for the Spirit to work.