Epistle to Titus
In Chapter 1, verse 9, Paul says that some among the Jewish Christians are false teachers. Paul says the false teachers are rebellious, empty talkers who claim to teach the law "without understanding" They cause the Christians to believe false things. Calvin wrote that vain (empty) talking (Greek: mataiologia) is not the same as useful doctrine. The false teachings don't help people to show piety and fear of God.