True Disciple of Jesus: The Lesson of Judas (John 15)

Introduction

Judas followed Jesus for three years. He was baptized, he preached the gospel, he watched people get saved, Christ even worked miracles through him. From the outside, people called him a disciple. And yet he didn't make it to the end.

This story raises a question that concerns you, and everyone who calls themselves a Christian: how do you tell the difference between someone who truly lives as a disciple of Jesus and someone who only carries the name? That's the question Jesus answers in John 15:1-17, in the very last instructions he gives before the cross, on the road leading his disciples toward the garden of Gethsemane.

Becoming a disciple is good. Staying one is better. And everything else depends on that staying.

Sermon Outline

1. The first mark of the true disciple: bearing fruit (John 15:1-8)

Jesus starts with a simple image: "I am the true vine, and my Father is the farmer." He circles back to this point several times, deepens it, and drives it toward one central verse: "In this my Father is glorified, that you bear much fruit; and so you will be my disciples" (John 15:8, World English Bible).

This verse answers the "why" question: why are you on this earth? To glorify God. And how is God glorified? By seeing you truly become a disciple of Jesus. What qualifies you as one isn't a little fruit now and then: it's "much fruit."

A tree is known by its fruit. Try telling an apple tree apart from a pear tree or a chestnut tree with nothing but leaves to go on, or in the dead of winter: you can't do it. The fruit gives away the tree. It's the same for the Christian. Christianity is never something private, something hidden. If the people around you see nothing different about you, there's a fruit problem.

Jesus doesn't give a checklist of what this fruit looks like. The word is left deliberately broad. Still, three broad strokes capture what should be visible:

• A life with Christ. A personal walk with God, an open Bible, regular prayer. The Word acts like pruning shears that cut away what isn't good (John 15:2-3). Nobody escapes hard seasons or doubts, but a Christian, looking back over his life, should see a pattern of ongoing growth.
• Public worship. A disciple of Jesus declares loudly that he loves him. That's why the church gathers publicly. A Christian who never gathers with God's people has a fruit problem: the gathering should be a priority, not an option.
• Concrete service. Christianity works like good yogurt: it acts on the inside and shows on the outside. The Christian serves. He uses everything he is and everything he has so the world will know Jesus. He walks into hard situations carrying peace, joy, forgiveness. He transforms his workplace, his family, his neighborhood.

And Jesus doesn't hide what's at stake. The branch that bears no fruit, "he takes it away" (John 15:2). That's strong, it's uncomfortable, and that's why, right in verse 3, he reassures the ones in the room: "You are already pruned clean because of the word which I have spoken to you." He's thinking first of Judas, who has just walked out. But he's also thinking of everyone else there, who in a few hours will abandon him too, and whom he doesn't reject either. This isn't about saying, "I sinned once, so Jesus is done with me." It's about understanding that a Christian who, over the long haul, bears no fruit at all has a real question to sit with.

2. The second mark: abiding in Christ (John 15:4-7)

After the image of the vine comes a command: "Remain in me, and I in you" (John 15:4). A branch can't survive on its own, cut off from the vine. It's the vine's root that draws up water, pulls in nutrients, makes the sap, and sends it up into the branches. Without that dependence, the branch produces nothing.

That's what abiding means: depending. It's making Christ your home, staying put there, not wandering off here and there. And Jesus is blunt about it: "Apart from me you can do nothing" (John 15:5). Not "a bit less." Nothing.

Our natural instinct runs the other way. We tell Jesus, "Look, I can manage this or that part of my life on my own. I've got discipline, I've got gifts. I'll call on you for the big sins, the big crises." Our culture pushes the same direction. Life gets sold as a long march toward independence: you leave your parents, you become self-sufficient, you don't much like depending on anyone.

Christ calls us to a complete about-face. The mature Christian isn't the one who needs to pray less because life is going better. It's the one who brings Jesus into absolutely everything he does, because he knows that apart from him, he can do nothing.

That's exactly what set Judas apart from the Eleven: Judas chose not to abide. He got up from the table. A branch cut off from the vine dries up little by little: it's good for nothing but being thrown into the fire (John 15:6). That's not an arbitrary punishment from God; it's the natural result of choosing not to stay anchored to the source of life.

3. The third mark: obeying Jesus (John 15:9-11)

How do you abide in practice? Jesus continues: "Even as the Father has loved me, I also have loved you. Remain in my love. If you keep my commandments, you will remain in my love, even as I have kept my Father's commandments and remain in his love" (John 15:9-10).

For Jesus, the language of love isn't primarily raised hands during worship. It's obedience. We usually assume the reverse: you'd first need to feel in love with Jesus before you could obey him. Jesus says the opposite: it's through obeying that you taste that love more deeply.

Here's a picture that helps: imagine Jesus comes and knocks on your door and says, "Come live with me. Here are the keys. The house is right up there, there's a big garden, gorgeous sunlight all year round, you're going to love it. I'm here, the door's open, the table's set." Jesus's love never moves. He's always in that house. The real question is: do you stay, or do you walk out? So often, when it feels like God is far away, it isn't God who left: it's us who wandered outside, and then had the nerve to ask, "Lord, why have you abandoned me?"

Look closely at the standard Jesus sets for his love toward you: "Even as the Father has loved me." The love shared between the persons of the Trinity, the holiest, most perfect, most patient, greatest, most unconditional love that exists, that is the very love Jesus has for you. That's why he adds: "I have spoken these things to you, that my joy may remain in you, and that your joy may be made full" (John 15:11). Who wouldn't want to be loved like that? No judgment, no conditions, the door always open?

Once you see that, obeying stops being a threat. Jesus's point isn't, "If you don't obey, I'll be angry." It's, "If you obey me, you'll taste a love this world is incapable of giving you."

4. The fourth mark: loving one another as Christ has loved us (John 15:12-17)

Obey, sure, but obey what? Jesus zeroes in on one central command, framed by a repeated line: "This is my commandment, that you love one another, even as I have loved you" (John 15:12), and then, five verses later: "I command these things to you, that you may love one another" (John 15:17).

If you had to sum up all of Christianity in one verb, it would be: love. And Jesus spells out what that means when he adds "even as I have loved you."

• A sacrificial love. "Greater love has no one than this, that someone lay down his life for his friends" (John 15:13). Love costs something: time, energy, sometimes money. Loving like Christ means loving even when the other person doesn't return the favor.
• A friendship love. "No longer do I call you servants... but I have called you friends" (John 15:15). Jesus doesn't call you "slave" or "some human being I have no use for." He calls you friend. And this friendship isn't built the way ours are, through conversations and shared interests over time. "You didn't choose me, but I chose you" (John 15:16). It's recruitment in reverse: he's the one who comes looking for you.
• An intentional love. Loving like Jesus isn't just refusing to return evil for evil. It's a love that goes and finds the other person wherever they are, with no merit required, no common ground needed. He chooses you before you're "good."
• A missional love. "I chose you, and appointed you, that you should go and bear fruit, and that your fruit should remain" (John 15:16). Christ loves us so that we, in turn, become equipped to love others. Loving one person also means equipping that person to love someone else.

The loop of the chapter closes. A true disciple bears fruit. He bears fruit because he abides in Christ. He abides in Christ by obeying him. He obeys Christ by loving, as Christ loved him. And that overflowing love produces exactly the fruit that glorifies the Father.

Key Takeaways

• A true disciple is known by visible fruit: a life with Christ, public worship, concrete service for others.
• Without dependence on Christ, you can do nothing. The mature Christian isn't more independent, he's more dependent.
• We abide in Jesus's love by obeying him. Obedience isn't what smothers joy, it's what unlocks it.
• The central command is to love as Christ loved: sacrificially, in friendship, with intention, in order to send.
• Judas is the warning; the Eleven who will run away in a few hours are the hope. What matters isn't your perfection, it's coming back to abide.

Personal Application

• Do the people around you see something different in you (a peace, a joy, a forgiveness) that points to Christ? Or has your faith become invisible?
• Which part of your life are you currently telling Jesus, "Don't worry, I've got this on my own"? What would happen if you invited him into it starting tomorrow morning?
• What's the last thing you know Jesus is asking of you, that you've been putting off obeying for weeks?
• Who around you could use a love "that comes looking," sacrificial and intentional, this week? What concrete first step could you take?
• Looking at your fruit right now, what's missing? And what if the answer wasn't trying harder, but coming back to abide?

Scriptures Referenced

• John 15:1-17 (WEB) · the true vine and the command to love
• John 15:8 (WEB) · "that you bear much fruit"
• John 14 (WEB) · the promise of the Holy Spirit that precedes the vine parable

FAQ

Does not "bearing fruit" for a season mean I'm not really saved?

Not necessarily. Jesus says these things to disciples who, within a few hours, will all abandon him, and he doesn't reject them. The problem isn't a single stumble: it's a life that, over time, produces nothing because it has cut the connection with Christ. If you're in a dry season, the right question isn't "am I lost?", it's "am I abiding? Am I obeying the last thing Jesus told me to do?"

What does "abiding" actually look like this week?

Three very simple things: letting the Word work on you (John 15:7), bringing Jesus into your ordinary decisions and challenges instead of leaning on your own strength, and obeying on the exact point where you know he's waiting for you. It isn't a spiritual performance: it's an active dependence that replaces autopilot.

How do you love "as Christ has loved us" without losing yourself?

By remembering that Jesus himself never lost himself: he loved by abiding in the Father's love (John 15:10). Christian love is sacrificial, but it's fed; it isn't invented out of our own reserves. You won't be able to love a difficult spouse, an ungrateful coworker, or a wary neighbor if you aren't abiding first. It's the vine that gives the branch what it needs to bear fruit, not the branch straining on its own.