As with the Parable of the Sower, which in Matthew and Mark occurs earlier in the same chapter, the man sowing the seed represents Jesus,[5] and the plant is the Kingdom of God.
"[7] Other commentators have suggested that the birds represent Gentiles seeking refuge with Israel[8][9] or the "sinners" and tax collectors with whom Jesus was criticised for associating.
[12] Some have identified a "subversive and scandalous"[9] element to this parable, in that the fast-growing nature of the mustard plant makes it a "malignant weed"[9] with "dangerous takeover properties".
And it is truth, and it has sprouted and come forth out of the earth, and righteousness begins to look down from heaven, and God is sending down His powers, gifts and angels, to lodge in the branches thereof.
"[15] Jerome: "For the dogmas of Philosophers when they have grown up, show nothing of life or strength, but watery and insipid they grow into grasses and other greens, which quickly dry up and wither away.
The branches of the Gospel tree which have grown of the grain of mustard seed, I suppose to signify the various dogmas in which each of the birds (as explained above) takes his rest.
Let us then take the wings of the dove, that flying aloft we may dwell in the branches of this tree, and may make ourselves nests of doctrines, and soaring above earthly things may hasten towards heavenly.
"[15] Hilary of Poitiers: "This grain then when sown in the field, that is, when seized by the people and delivered to death, and as it were buried in the ground by a sowing of the body, grew up beyond the size of all herbs, and exceeded all the glory of the Prophets.
By which we understand the Apostles, who put forth of Christ’s might, and overshadowing the world with their boughs, are a tree to which the Gentiles flee in hope of life, and having been long tossed by the winds, that is by the spirits of the Devil, may have rest in its branches.
"[15] Gregory the Great: " The birds lodge in its branches, when holy souls that raise themselves aloft from thoughts of earth on the wings of the virtues, breathe again from the troubles of this life in their words and comfortings.