Root to Fruit
Brennan Cattani · September 10, 2025
Second in a pair. The first post, The Four Idols, named the false gods we keep bowing to. This one is about how you actually find them in your own life.
Each Tree Is Known by Its Own Fruit
"For no good tree bears bad fruit, nor again does a bad tree bear good fruit, for each tree is known by its own fruit. For figs are not gathered from thornbushes, nor are grapes picked from a bramble bush. The good person out of the good treasure of his heart produces good, and the evil person out of his evil treasure produces evil, for out of the abundance of the heart his mouth speaks."
— Luke 6:43–45 (ESV)
Here is the thing we get backwards almost every time: the fruit is not the problem. The fruit is the evidence.
When we notice bad fruit in our lives — the sharp word, the third drink, the hours lost to a screen, the silence we punish someone with — our instinct is to go after the fruit. Pick it off. Try harder. Set a rule. And we can do that. We can pull a lot of fruit off a tree in a hard week of effort. But a tree does not stop being what it is because you emptied its branches. It just grows more.
Jesus is not telling us to manage our fruit. He is telling us that fruit is diagnostic. It tells you the truth about the tree. And that is good news, because it means the mess you can see is not just something to be ashamed of — it is information. It is the Spirit handing you a thread to pull.
Two Trees and One Drought
Scripture keeps handing us the same picture. The blessed man "is like a tree planted by streams of water that yields its fruit in its season, and its leaf does not wither" (Psalm 1:3). The wicked are "like chaff that the wind drives away" (Psalm 1:4).
Jeremiah sets the two side by side. The one who trusts in man and makes flesh his strength is "like a shrub in the desert" in a parched and uninhabited salt land. But the one whose trust is the Lord:
"He is like a tree planted by water, that sends out its roots by the stream, and does not fear when heat comes, for its leaves remain green, and is not anxious in the year of drought, for it does not cease to bear fruit."
— Jeremiah 17:7–8 (ESV)
Notice that both trees get the same weather. The drought is not selective. The heat comes for everyone. What differs is not the circumstance — it is what the roots have been drinking all along.
This is why the flourishing of a tree is tested in the circumstances of life. Heat comes. Drought comes. And what comes out of us in those seasons is not manufactured by the heat; it is revealed by it. The traffic did not make you angry. The layoff did not make you anxious. They were the drought, and the drought showed everyone — including you — where your roots have been going for water.
Then Jeremiah names the difficulty in the very next breath: "The heart is deceitful above all things, and desperately sick; who can understand it?" (Jeremiah 17:9). Which is precisely why we need a method, and why we need each other.
"Every sinful behaviour is rooted in a false belief about God."
— Tim Chester
Working Backwards: Fruit to Root
So we start where we can actually see something. You cannot inspect your own roots directly — that is rather the point of Jeremiah 17:9. But you can look honestly at your fruit and follow it down.
- What am I doing? The behaviour itself, named plainly, without the softening language we reach for. Not "I was a bit short with her." What did you actually say?
- What am I feeling? Underneath the behaviour there is almost always an emotion, and we are usually much worse at naming these than we think. Anxious. Ashamed. Envious. Trapped.
- What do I want? Every strong feeling is attached to a desire — something you wanted and did not get, or something you have and are terrified of losing.
- What do I believe? And here is the root. What am I believing about God in this moment that makes that desire feel like life or death?
That last question is the whole exercise. Every behaviour is coming out of a belief. Not the belief you would write on a doctrinal statement — the one you are actually operating on at 10:45pm when the thing goes wrong.
Which reframes something we usually treat as pure nuisance. Anxiety is a gift. Not pleasant, but a gift — it is the instrument panel lighting up, telling you that something you are leaning your weight on is moving. Anger is the same. So is the flush of shame, the compulsive refresh, the sudden need to explain yourself. Instead of only asking how to make the feeling stop, ask what it is pointing at. What is at the root of what I am worshipping here?
"Keep your heart with all vigilance, for from it flow the springs of life."
— Proverbs 4:23 (ESV)
Four Questions That Go Back Up the Tree
Tracing fruit down to root is only half the work. Once you have found the lie, you have to preach the truth back into that exact spot — root to fruit. Four questions do it, and they follow the shape of the whole story of God:
- Who is God?
- What has he done?
- Who am I?
- What do I now do?
Order matters enormously here. We nearly always start at the fourth question, because it is the one that feels productive. But what do I do disconnected from who God is is just self-improvement with a Bible verse attached to it — and it will send you straight back to the idol of success.
Go back to the garden and watch it work. God is Creator; that is who he is. He made them; that is what he has done. They are the created, made in his image and loved; that is who they are. And only then: be fruitful, fill the earth, tend this garden. Identity was never earned by the work. The work flowed out of the identity. The serpent's whole strategy was to get them to act their way into a standing they had already been given.
The same four questions are the four movements of the story we tell every week:
- Creation — who am I, really?
- Fall — what is my problem? What is keeping me from being who I feel I need to be?
- Redemption — what is the solution to that problem?
- Restoration — what is my hope? If the solution is real, how will things actually be different?
Every false story we live in has its own version of these four. Notice where you have quietly swapped one out, and you have usually found your idol.
Jesus Is the Better
Here is the question that turns all of this from analysis into good news. When you get to the root of something — in your own life or sitting across from a friend — ask: what do they need to know, and to feel, about Jesus? About his life, his death, his resurrection, his ascension, his glorification?
Because Jesus is not merely the one who forgives the bad fruit. He is the better version of the very thing the idol was counterfeiting.
- To the one grasping for control: if there was ever a moment when God looked completely out of control, it was the cross. And he was never more in control than he was at that moment.
- To the one starving for approval: Jesus has already heard "this is my beloved Son, with whom I am well pleased" — and he heard it before he had done a single recorded work of ministry.
- To the one hiding in comfort: he left glory, and he did it for the joy set before him.
- To the one grinding for success: he performed perfectly, precisely so that you would not have to.
That is what it means to say Jesus is the better. Not "stop wanting that." Rather: you were right to want it, and you have been trying to get it from something that cannot give it.
Not Shame — Grace
A warning, because this work goes wrong in a predictable way. When we find the root — ours or someone else's — the temptation is to use the consequences of sin to try to free someone from sin. To let the weight of it sit there and do the motivating.
Don't. Grace is more compelling. When Adam and Eve hid, God's question was not an accusation but an invitation: "Who told you that you were naked?" (Genesis 3:11). God wants to be the one who tells us the truth about ourselves. Wallowing in shame has never once been the solution — it is just the idol of self, running in reverse.
So it is worth asking honestly what is actually motivating us when we are not believing the gospel. Usually it is one of three: self-righteousness, shame, or the avoidance of punishment. None of them produces good fruit, and all of them can look impressively like obedience for a while. And blame — blame is simply looking for someone else to atone for your sin.
If someone is not experiencing any grief over their sin, they probably do not believe sin is serious. But if someone stays stuck in shame, they probably have not yet grasped the sheer magnitude of God's grace. It is actually a kind of pride to believe you have out-sinned it.
This Is the Spirit's Work
One more thing, or all of the above becomes a very sophisticated form of striving. Bible study does not overcome sin. The Spirit of God does. Understanding the mechanics of your own heart is genuinely useful, and it is not the power that changes it. If we manage to talk someone out of a sin by sheer insight, we have only taught them that we are their Holy Spirit.
We are fighting on three fronts — the world, the flesh, and the devil — and the flesh will happily throw up walls to keep the Spirit from doing the driving. Which is why Paul tells us to take every thought captive to obey Christ (2 Corinthians 10:5). Not every behaviour. Every thought. That is root-level work, and it is the Spirit's specialty. He is very good at preaching Christ.
And it is not a solo project. The heart is deceitful above all things — which means the person least qualified to audit your roots, unassisted, is you. This is what our communities are actually for.
Gospel Fruit
The promise at the end of all of this is not that you will become an expert on your own sin. It is fruit — the kind that grows on a tree planted by water, in season, without withering, and without you standing over it straining to produce it.
"But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control; against such things there is no law."
— Galatians 5:22–23 (ESV)
That list is not a chore chart. It is a description of what grows on a tree whose roots are in the right stream. You do not get patience by trying hard to be patient. You get it by believing that God is great, so you do not have to be in control — and then discovering, some months later, that you did not lose your temper in the place you always used to.
Try It This Week
Pick one piece of fruit from the last seven days. Something small and specific — a moment you snapped, withdrew, obsessed, or numbed out. Then walk it down: What was I doing? What was I feeling? What did I want? What was I believing about God right then? And then walk it back up: Who is God? What has he done? Who am I? What do I now do?
Then do the part that is hardest and matters most: tell someone. These are good questions to bring to your missional community, and good ones to ask each other:
- Tell me about your affection for Christ — where are you growing in it?
- How is your love for the body?
- How has your experience of grace been lately?
- What are you in need of today?
Our Gospel Fluency page has the Root to Fruit worksheet and a feelings chart you can print and work through, on your own or around a table.