“Be on your guard against false prophets who come to you in sheep’s clothing but inwardly are ravaging wolves. 16 You’ll recognize them by their fruit. Are grapes gathered from thornbushes or figs from thistles? 17 In the same way, every good tree produces good fruit, but a bad tree produces bad fruit. 18 A good tree can’t produce bad fruit; neither can a bad tree produce good fruit. 19 Every tree that doesn’t produce good fruit is cut down and thrown into the fire. 20 So you’ll recognize them by their fruit. (Matthew 7:15-19)
Guard (15): Jesus warned the people to continually guard against or discern the seemingly valid message of false teachers, those who come or speak in God’s name but deceive believers. They sound legitimate, but their message is intended to distract and destroy the faith of believers. Jesus describes them as wolves covered in sheep skin. Their outer appearance covers their true nature and character.
Fruit (16-17): We know false teachers by their fruit. In this case do their words and deeds match? Further, their message did not match the doctrine believers had been taught. To make his point, Jesus asked if thorns come from grapevines and thistles from fig trees. That is, what is taught should be measured against the source. Bad or diseased fruit spoils the crop. The application of his illustration is that even good people sin but that is not their character. On the other hand, non-believers may do good deeds but that does not reflect their true character.
Godly teachers may be incorrect on occasion, but they do not intend to deceive. But the intent of false prophets and teachers is to deceive. Their message may appear to be true, but their intent is to deceive.
Quality (18-20): In these verses, Jesus repeats what he had just said in different words. Good trees produce good fruit, and bad trees produce bad fruit. He then told his listeners to measure the way the teachers lived against their words. He extends the illustration by stating that rotten trees, those that do not produce good fruit, will be removed and thrown into the fire. Bad trees have no value and just take up space. Jesus’ point is that discipleship involves more than religious activity.
He concludes the point on fruit by stating that the quality of the fruit is the test of the tree just as the quality of the fruit is the test of the teacher. Good teachers produce good fruit.
