Right doctrine does not automatically produce right living because a person can hold a true statement about God without letting it govern what they do. Jesus gave a test for that exact gap: a tree is known by its fruit. This guide reads that teaching closely in Matthew 7. Then it asks you to run the test on your own confident beliefs instead of someone else’s. You can work through it alone in about an hour, or with a group over one or two meetings.
The guide moves in a set order. First you read the passage in its setting. Then you sort out what fruit means, hear how Lisa Fields and Dr. Jemar Tisby apply the test, and notice the limits Jesus places on it. Last, you do a fruit inventory on one doctrine you hold. Keep a Bible open, and read each passage slowly before you read anything said about it.
Read the passage before the proverb
Most of us know the line as a saying we have heard and repeated. It reads differently in its own paragraph. Here is Matthew 7:15-20:
Beware of false prophets, which come to you in sheep’s clothing, but inwardly they are ravening wolves. Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. Wherefore by their fruits ye shall know them.
Before reading further, write down three observations. Who is the warning about? What disguises them? What does Jesus repeat at the start and the end of the paragraph?
The warning is about prophets, people who claim to speak for God. Their disguise is sheep’s clothing, which means they look like the flock. That detail matters for this guide. The danger Jesus describes cannot be spotted by appearance or by claim, because the false prophet’s appearance and claim are exactly what imitate the real thing. Correct religious language can be sheep’s clothing. So Jesus points to something that a costume cannot fake over time: what grows.
Notice also how Jesus argues. Verse 16 asks a question nobody would answer wrongly. No one picks grapes from a thorn bush. Verse 18 then makes a strong claim: a good tree cannot bring forth evil fruit. This is teaching by image, and it should be read as an image. Jesus is not saying a faithful person never commits a single wrong act. If that were the meaning, no one would pass. He is talking about the kind of tree and its steady crop. The test concerns what a life reliably produces, not one bad afternoon.
Where the warning sits in the sermon
The paragraph is near the end of the Sermon on the Mount, and the verses around it keep turning the light back on the listener. Earlier in the same chapter, Jesus asks, “And why beholdest thou the mote that is in thy brother’s eye, but considerest not the beam that is in thine own eye?” (Matthew 7:3). Two verses later he says, “Thou hypocrite, first cast out the beam out of thine own eye; and then shalt thou see clearly to cast out the mote out of thy brother’s eye” (Matthew 7:5).
Right after the fruit paragraph, Jesus moves from false prophets to ordinary followers: “Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven” (Matthew 7:21). The next verse is sobering. The people he turns away point to prophesying, casting out devils, and many wonderful works, all done in his name (Matthew 7:22). They had correct words and impressive results. Jesus still does not count those things as the fruit he is looking for.
Then the sermon ends with two builders. Both hear the same words. One does them and one does not, and a storm reveals the difference (Matthew 7:24-27).
Be honest about what this context does and does not show. The plain historical meaning of verse 16 is a warning to discern false teachers. Applying the fruit test to yourself is an application, not the verse’s first point. But it is an application the chapter itself supports. The sermon tells hearers to examine their own eye first, warns them that saying “Lord, Lord” is not enough, and ends on hearing versus doing. Turning the test inward is a way of reading Matthew 7 as a whole.
What counts as fruit?
Christian interpreters have read “fruit” in a few ways, and the readings overlap more than they compete.
- Conduct and character. Many readers connect the image to Paul’s later list: “But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, Meekness, temperance: against such there is no law” (Galatians 5:22-23). On this reading, fruit is the kind of person a teacher becomes.
- Words and teaching. Elsewhere Jesus ties the tree image directly to speech: “Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by his fruit” (Matthew 12:33). In Luke’s version he adds, “for of the abundance of the heart his mouth speaketh” (Luke 6:45). On this reading, a false prophet’s teaching is itself the bad fruit.
- The effect on others. Some readers include what a teacher’s ministry produces in the people who follow them.
The passage does not force a choice, and the parallel texts suggest Jesus held these together. What a person says flows from the same heart as what they do. For self-examination, the first two matter most. You can look at how you live, and you can listen to what your mouth produces when your favorite doctrine comes up. Matthew 7:21 adds one clarification. Good fruit is tied to doing the Father’s will, which is why the impressive works of verse 22 do not qualify on their own.
Turning the test on yourself
In her conversation with Dr. Jemar Tisby, Lisa Fields affirms right belief and then says that if belief “doesn’t translate to practice, then we have to interrogate the belief.” She is clear about her starting point: “I believe in doctrine.” Her claim is not that doctrine is unimportant. It is that a gap between belief and practice is evidence, and evidence has to be examined.
The word “interrogate” is worth slowing down on. Questioning a belief does not mean discarding it. When you interrogate a confident doctrine and find no fruit, at least three answers are possible. The belief may be mistaken. The belief may be true but held in a distorted shape. Or the belief may be true and you may hold it only as a statement you can defend, not as something you trust. Each answer calls for a different response.
Tisby names the third possibility directly: “So I think we have to really ask ourselves whether we believe this faith we profess or not.” He also says when the answer tends to show: “our true beliefs come out in times of pressure and times of call for courage.” That lines up with the way Jesus closes the sermon. The two houses look alike until the rain and wind arrive. Pressure does not create what a person believes. It reveals it.
Tisby also describes how a confident theology can shift the weight off of fruit. He says he was drawn to systematic theology that broke belief about God into clear categories, and he calls that good as far as it goes. The risk, in his words, is that “what tends to sneak in is a certain elevation of that kind of theological formulation.” Apply that to yourself carefully. A precise formulation is a good gift. But if the formulation becomes the thing you are proudest of, you may start counting accuracy as the fruit. Matthew 7:22 warns against counting the wrong crop.
Two limits on the test
The fruit test is strong, and it has boundaries. Tisby states the first one: “when it comes to the state of somebody’s soul, that’s between them and Jesus.” He follows it at once with “But Jesus very clear about what the fruit of the spirit looked like.” Visible fruit can be assessed. The final state of a soul is not ours to pronounce.
That limit applies when you are the tree. This inventory is not a verdict on whether you are saved. Faithful Christians read passages like Matthew 7:23 differently and hold different views on what persistent bad fruit means for a believer’s assurance. Some hold that a truly saved person can never be lost. Some hold that true believers will persevere, so lasting fruitlessness shows faith was never real. Others hold that a believer can turn away. This guide does not settle that question. Its aim is honest growth, not anxious self-condemnation.
The second limit concerns truth itself. The fruit test examines the tree, the person or the teacher. It does not make a doctrine true or false by the behavior of the people who hold it. A true teaching held by a hypocrite is still true, and Scripture remains the measure of what is true. What the test exposes is whether a person actually believes what they say, and whether they are holding it the way Scripture means it to be held.
Matthew 7:5 holds both limits together. The beam comes out of your own eye first. Then you see clearly enough to help someone else. Self-examination does not cancel discernment. It makes discernment trustworthy.
Practice: a fruit inventory on one doctrine
Set aside a quiet stretch of time and something to write on. Work through the steps in order.
- Choose one doctrine you would confidently defend in an argument. Write it in one plain sentence. Pick something you actually hold firmly, such as salvation by grace, the authority of Scripture, God’s care for the poor, or every person bearing God’s image.
- Trace its implications. Under your sentence, write what this doctrine would make true of a person who really believed it. For example, if every person bears God’s image, how would that person speak to someone who annoys them?
- Read Galatians 5:22-23 and Luke 6:45 again. Mark which fruits this doctrine should produce in you, and note what it should change about your speech.
- Gather evidence from the past month. List specific moments: a conversation where the doctrine came up, how you talked about people who disagree with it, and one time acting on it cost you something. Write what happened, not how you feel about it now.
- Sort the gap. Where you find little fruit, decide which of the three answers fits best: the belief may be mistaken, held in a distorted shape, or held as a statement you do not live. A mistaken belief calls for study. A distorted one calls for correction. An unlived one calls for obedience.
- Look at who shaped how you hold it. Tisby suggests looking at the books a pastor opens to prepare a sermon to learn whom that pastor treats as authoritative. Do the same with your own shelf and playlist. Who taught you this doctrine? Whose reading of it have you never heard? Choose one faithful voice from a different setting and read or listen to them on this topic.
- Pick one act for this week. Name a single concrete behavior this doctrine requires of you, and do it. Come back to your page in seven days and write what happened.
Questions for discussion or reflection
- Jesus says false prophets wear sheep’s clothing (Matthew 7:15). What might sheep’s clothing look like for someone whose doctrine is correct?
- The people in Matthew 7:22 point to prophecy, exorcisms and wonderful works. Why might Jesus refuse to count these as good fruit? What would you be tempted to point to?
- Matthew 12:33 and Luke 6:45 connect fruit to speech. When you talk about your most confident doctrine, what does your tone suggest about your heart?
- Of the three possible answers in step 5, which is hardest for you to consider about your own beliefs? What makes it hard?
- Tisby separates assessing visible fruit from judging a soul. How should that change the way you run this test on yourself? On others?
- What evidence would actually convince you that you hold a true doctrine in a distorted way?
If you are leading a group
Keep the group’s attention on its own trees. This material makes it easy to spend an evening listing public figures and churches that fail the test, and that conversation will not help anyone in the room. No one should be pressed to share their inventory. Invite people to share only the category they landed on in step 5, or one question they are still holding. If someone leaves anxious about their salvation, remind them that this guide does not decide that question, and encourage them to talk with a pastor or trusted mature believer. Two meetings work well: one for the passage and the two limits, and one a week later to report on the act each person chose.
A question to carry
Lisa Fields says, “And I think to have a true relationship with Jesus is to be integrated.” Tisby puts the same hope another way: “coming to Jesus is about wholeness.” He then describes that wholeness as “taking the fractured parts of ourselves and putting them back together.” The builder in Matthew 7:24 is integrated in exactly this sense. What he hears and what he does are the same house. Take your one doctrine into the coming week and watch for the moment it costs you something. What you do in that moment will tell you more about what you believe than your best argument ever has.