The gospel of John is the gospel of the spiritual rebirth by excellence, this gospel has a different literary style to the rest, in fact it is not considered a synoptic gospel. In the Gospel of John we do not find the teachings of Jesus through Parables, which appear in Mark, Matthew and Luke. The Gospel of John focuses on the use of Allegories and not Parables.
In the Gospel of John, Jesus at the Last Supper, in his farewell, tells the disciples an allegory about the vine:

I am the true vine
and my Father is the gardener.
He cuts off every branch of mine that doesn´t produce fruit
and he prunes the branches that do not bear fruit so they will produce even more.
John 15:1-2

In the Gospels, the Kingdom of God is often compared with the plant, the tree, the vine, the seed. In the Gospel is presented The Parable of the Mustard Seed, Mark 4: 30-32; and the Parable of the Fig Tree, Mark 13: 28-32.
The Spirituality, the ethics is progressive, incremental, begins with the small gestures, like the plant that produces fruit. God is the gardener, that is, God is the origin of the gifts (the gifts are perfections) and Jesus is the vineyard, the master of the wisdom.
The fruit of the vineyard is the wine, and where there is wine there is joy. Joy is a fruit of the wisdom, of that gardener who takes care of his vineyard.
Joy is the exaltation of the mood, it is a fruit of the spirit, Galatians 5:22; it is an attachment and not a passion, it is an action of the spirit. Joy is different from happiness. Happiness is a desire of the soul. Happiness is a welfare state according to Aristotle.
Joy implies happiness, but not upside down. Joy is intimately united with joy and fundamentally with hope.
The kingdom of God is the man who becomes "son of God" and God who becomes "son of man". Is the man who seeks the gifts, the perfections of God and on the other hand the perfections that are personified in Christ.
Christ personifies the gifts and the divine attributes of God.
Christ personifies the joy of God, is the vine that produces fruit, fruits of blessing and wisdom.