Matthew 13:32

Now, in place of the herb, the preaching of the prophets was given to ailing Israel. But the birds of the air dwell in the branches of the tree that rises high above the ground. We see the apostles as branches stretched out by the power of Christ and overshadowing the world. The people of all nations fly there in the hope of life and, disquieted by the whirling winds—that is, by the breath and blowing force of the devil—they come to rest upon those tree branches.

(Verse 32) The kingdom of heaven is like a mustard seed, which a man took and sowed in his field. It is the smallest of all seeds, but when it has grown, it is greater than the herbs and becomes a tree, so that the birds of the air come and nest in its branches. It should not be a burden to the reader if we present all the parables. For those things that are obscure should be explained more fully, lest they be more entangled by excessive brevity than expounded. The kingdom of heaven is the preaching of the Gospel, and the knowledge of the Scriptures which leads to life; and of which it is said to the Jews: The kingdom of God will be taken away from you, and given to a nation producing its fruits (Matthew 21:43). Therefore, the kingdom of heaven is like a grain of mustard seed, which a man took and sowed in his field. The man who sows in his field is understood by many as the Savior, who sows in the hearts of believers. By others, the man himself who sows in his field, that is, in himself and in his own heart. Who is this who sows, if not our understanding and our soul, who, receiving the grain of preaching, and nurturing the seed with the moisture of faith, causes it to sprout in the field of his own heart? The preaching of the Gospel is the least of all disciplines. Indeed, for the first doctrine has no faith in the truth, preaching man as God, God as dead, and the scandal of the cross. Compare such doctrine with the dogmas of philosophers and their books, the splendor of eloquence and the composition of speeches, and you will see how much smaller it is than the other seeds of the Gospel. But when it grows, it demonstrates nothing biting, nothing vivid, nothing vital, but all flabby and withered, and soft, it boils in vegetables, and in herbs, which quickly wither and fall. However, this preaching, which seemed small at first, when it is sown either in the soul of the believer or in the whole world, does not rise in vegetables, but grows into a tree: so that the birds of the sky (which we must understand as either the souls of believers or the strengths owned by God's service) come and dwell in its branches. The branches of the evangelical tree, which have grown from the mustard seed, are diverse in doctrines, on which each of the aforementioned birds rests. Let us also assume the wings of the dove (Ps. LIV), so that, flying towards higher things, we may…