This passage contains one of the simplest and one of the most well-known allegories of the Christian life: the vine and the branches.
The popular belief is that you need to behave well in order to be a good Christian. You get closer to God by acting better, doing good deeds, and being kind to other people. You then make God happy by how nice you have become.
Jesus teaches the complete opposite!
It was late Thursday night, on Jesus’ final night on earth. As he walked through the streets of Jerusalem with his disciples, the great temple would be in full view in front of them. A massive golden vine covered the top of the wall, with the grapes “as tall as a man’s height” (according to Josephus) .
In front of this backdrop, Jesus says, “I am the true vine.”
The great vine was the national symbol of Israel. God himself had used the vine to illustrate Israel, but they had turned away from God. Instead of showing God’s glory to earth, they had become a wild vine bearing useless fruit (see Isaiah 5:1-7 and Jeremiah 2:21).
Israel was supposed to be the means to bring people to God, but they failed. Israel was to showcase God’s glory, but they thought only of themselves. Unlike faithless Israel, Jesus is the true vine. Jesus is the way to God (John 14:6) and he brings glory to God (John 15:8).
All of us who have a relationship with Jesus Christ have a part in Jesus’ mission. He is the vine, the true vine, and we are the branches.
Our job – our essential job – is to abide in Him. As a branch stays in the vine, so we are to stay close to Jesus Christ. Jesus supports and gives life to his people in the same way that the vine supports and gives life to the branches.
Jesus never teaches that you should do good things to get close to God. He says the opposite – stay close to him and he will do the good things through us. This is beyond anything that we can do, and so God gets all of the credit!
Jesus makes several wonderful promises of what will happen when we abide in him.
We produce fruit when we abide in him. Jesus gives us permanent, tangible results when we stay close with him. This fruit in our lives may vary, but it includes repentance, good works, godly attitudes, wisdom, praise, and impact on others (see below for a more detailed list).
We are totally helpless to generate this fruit apart from Jesus Christ. We often think that our problem is that we are not trying hard enough. Jesus says to stop trying altogether. “Just abide in me!”
“We are not handicapped, we are paralyzed!” – Stephen Davey 
We will be pruned when we abide in him. He cuts out the empty parts of us so that we can produce more fruit. This pruning process can be painful, but God wants us to grow into a more fruitful branch for Him.
“And so when we have to pass through great trials, deep waters and many sorrows, it is not an evidence that He does not love us, that He does not care for us.” – H.A. Ironside 
He answers our prayers when we abide in Him. God never promises to answer our prayers when we are avoiding Him (Psalm 66:18). But when we abide in Him, we are able to pray from the very heart of Jesus Christ, asking what he himself would ask (see here).
We radiate the love of Jesus Christ when we abide in Him. We are anchored in the love of Christ and we show it by our love for others. We are no longer slaves, but friends of the Lord Jesus Christ! He demonstrated his love for us, as his friends, by giving his own life for us (see also Romans 5:8).
We keep Jesus’ commandments when we are anchored in His love by abiding in Him. It is no longer a duty to obey him but an act of love. We show our love to Him by loving His children.
We experience full joy when we abide in him. Jesus was only hours from dying on a Roman cross, yet he promised joy to his disciples! This joy is beyond happiness, and can survive through the worst of pain. How do we experience this joy? We experience this full joy when we abide in Him.
We experience this full joy when do what we were created to do – to glorify God!
Jesus gives one more promise in this section. Your time is limited if you do not know Jesus Christ. If you have never believed in Him, then you are as useless to Him as a branch that never produces grapes. You can pretend to be close to Jesus Christ, but take a warning from the useless branch. The destiny of the useless branch is to be thrown away, to wither, to be gathered, thrown into the fire, and burned.
If you have not believed in Jesus Christ, do not hesitate any longer! This may be your last chance to believe in Him (see here). Be warned, but come to him before you are thrown out like the useless branch.
If you have believed in Jesus Christ, abide in him. Abide in Him! Stay close to Jesus Christ and obey him out of your love for Him. All of the good deeds that you can do are useless if you do them apart from Jesus Christ.
Previous Post: The Holy Spirit