The kingdom and Jesus: It is the smallest of all seeds, but it becomes the largest of garden plants. Matthew 13:32
Jesus, according to the account of all the evangelists, Matthew, Mark, Luke, and John, proclaims a mysterious Kingdom to his disciples and listeners. This Kingdom is a domain or empire that cannot be fully grasped by human reason, and that is why Jesus uses fantasy stories or parables to illustrate it to the common and simple people.
And all the parables of the divine master have the same purpose, to show some spiritual characteristic of this empire or government of the divine perfections ("Be perfect, therefore, as your heavenly Father is perfect" Matthew 5:48) to illuminate his followers. And this spiritual Kingdom has fundamental characteristics: it is edifying, progressive, gradual, expansive, and benevolent.
And a parable that reflects this spiritual truth very well is the parable of the mustard seed, this parable is recounted in Mark 4:30-32, Luke 13:18-19, and Matthew 13:31-32. And this narrative of Jesus has a clear objective, what this story is explaining in a metaphorical sense is that the good is a nature; for example, the nature of the seed is the tree, and the nature of the worm is the butterfly, every being tends towards its own good.
The mustard seed that grows and develops represents man; at first the Kingdom seems imperceptible and insignificant, but as it gradually develops in the heart of man, this Kingdom leads man to spiritual rebirth and to likeness to God in essence ("No one can see the kingdom of God unless they are born again" John 3:3). The mustard seed is the rational man, and the tree that shelters the birds is the spiritual man. In other words, the nature of man, or what man tends towards in his development, is the conformity to God, like the worm that transforms into a butterfly.
With these wise words, the Gospel of Matthew recounts the parable: "The Kingdom of Heaven is like a mustard seed planted in a field. It is the smallest of all seeds, but it becomes the largest of garden plants; it grows into a tree, and birds come and make nests in its branches" Matthew 13:31-32.
The Kingdom of God is a grace that surpasses man's natural logic and introduces him into the mysteries of God.

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