The easy-peasy way to discern a false teacher
By Elizabeth Prata

There is an easy way to tell if a teacher you like, follow, admire, or ‘learn from’ is false. I’m going to reveal this heretofore (not so) hidden way to detect false teachers. I could go on like the liberal theologians who say ‘this is a new method for interpreting’ or ‘I have a freshly discovered method…’ but I won’t. It’s been there all along. Here it is. Are you ready for this shocking message?
The one who says, “I have come to know Him,” and does not keep His commandments, is a liar, and the truth is not in him;” (1 John 2:4).
People who say “Jesus, Jesus” but sin against him constantly by living a life contrary to His commands, or teach falsely, do not have the truth in them. In other words, they are not saved.
They are revealed to be hypocritical. As John wrote in the verse above, a person cannot have an authentic relationship with Jesus and obstinately and consistently oppose His commandments with their actions.
The inward transformation of a person results in outward transformation (compare Matt 15:11). The work of Christ in a person necessitates them acting on His behalf, out of love (1 John 3:17). Source Faithlife Study Bible
Jesus made it very easy for us. Yet so many people say “but, but, but” and make layers upon layers of excuses.
“But she talks about Jesus all the time!” Of course they do. They talk about knowing Jesus right up to the moment they face Jesus and claim to His face that they know him. But they don’t. And he says so.(Matthew 7:22-23).
“But she does so many nice things!” I know. So did the Pharisees. Outwardly they did all the right things, seemingly. But Jesus said, “Woe to you, scribes and Pharisees, hypocrites! For you are like whitewashed tombs which on the outside appear beautiful, but inside they are full of dead men’s bones and all uncleanness.” (Matthew 23:27). Inside they were dead. They did not have the truth in them.

“But she only to men preaches a little“. Sorry, but “whoever keeps the whole Law, yet stumbles in one point, has become guilty of all.” (James 2:10). Even a small sin, or a single transgression against God’s law, means they are guilty and due his or her just penalty.
“But lifestyle doesn’t count, and her doctrine is fine!” Sorry, but Titus 2:3-5 is only one of several standards for Christian women to adhere to a certain lifestyle. “Older women likewise are to be reverent in their behavior, not malicious gossips nor enslaved to much wine, teaching what is good, so that they may encourage the young women to love their husbands, to love their children, 5to be sensible, pure, workers at home, kind, being subject to their own husbands, so that the word of God will not be dishonored.” It is dishonoring to God to live otherwise. Men too. Lifestyle counts. So does character. Are they divisive? Slanderous? Combative? Unteachable? Then they are false.
“But you don’t know their heart!” Yes we do. In true Christians, “The Holy Spirit implanted in us a heart that can understand and love spiritual truth” says Tom Pennington in his sermon Recognizing False teachers. A false teacher is not saved and thus does not have the Holy Spirit indwelling his heart. You can detect what is in their heart because the Bible tells us these people are greedy, liars, deceivers, hypocrites, and more.
Jesus said, “By their fruit you shall know them”. Not ‘maybe, but you WILL know them. We cannot see their heart but what comes out of their mouth is what defiles them, and then we can see the evidence. Making a determination based on evidence (their fruit) is not ‘seeing their heart’. It’s making an intelligent and accurate assessment of their output.

For example, didn’t the Pharisees make a show of praying, fasting, and worshiping? But we can see the evidence of their self-serving attitude in their lengthened tassels, announcements of fasting, pretentious prayers at the street corners, choosing the chief seats. Look beyond their show. See the fruit.
Barnes Notes says of the 1 John 2:4 verse, “Is a liar – Makes a false profession; professes to have that which he really has not. Such a profession is a falsehood, because there can be no true religion where one does not obey the law of God.“
Gill’s Exposition says, and the truth is not in him; there is no true knowledge of God and Christ in him; nor is the truth of the Gospel in his heart, however it may be in his head; nor is the truth of grace in him, for each of these lead persons to obedience.
Did you catch that reference to the heart? The truth of the gospel is not in his heart. “What is in the heart will emerge, and corrupt theology will result in a corrupt life. False teaching and perverted living are inseparable, and eventually will become manifest.” (Grace to You, “What are the Marks of a False Teacher?“)
We over-complicate things. Just go back to the Bible. A false teacher will claim to know Jesus but constantly, unrepentantly, and long term, be disobedient to His commandments.
Further Reading