35 And Jesus went about all the cities and villages, teaching in their synagogues, and preaching the gospel of the kingdom, and healing every sickness and every disease among the people.
[AD 367] Hilary of Poitiers on Matthew 9:32-35
The natural order of things is here preserved; the dæmon is first cast out, and there the functions of the members proceed. And the multitude marvelled, saying, It was never so seen in Israel.

Or; By the dumb and deaf, and dæmoniae, is signified the Gentile world, needing health in every part; for sunk in evil of every kind, they are afflicted with disease of every part of the body.

But by the knowledge of God the frenzy of superstition being chased away, the sight, the hearing, and the word of salvation is brought in to them.

The wonder of the multitude is followed up by the confession, It was never so seen in Israel; because he, for whom there was no help under the Law, is saved by the power of the Word.

[AD 407] John Chrysostom on Matthew 9:32-35
This was not a mere natural defect; but was from the malignity of the dæmon; and therefore he needed to be brought of others, for he could not ask any thing of others as living without voice, and the dæmon chaining his spirit together with his tongue. Therefore Christ does not require faith of him, but immediately healed his disorder; as it follows, And when the dæmon was cast out, the dumb spake.

They set Him thus above others, because He not only healed, but with such ease, and quickness; and cured diseases both infinite in number, and in quality incurable. This most grieved the Pharisees, that they set Him before all others, not only those that then lived, but all who had lived before, on which account it follows, But the Pharisees said, He casteth out dæmons through the Prince of dæmons.

What can be more foolish than this speech of theirs? For it cannot be pretended that one dæmon would cast out another; for they are wont to consent to one another's deeds, and not to be at variance among themselves. But Christ not only cast out dæmons, but healed the lepers, raised the dead, forgave sins, preached the kingdom of God, and brought men to the Father, which a dæmon neither could nor would do.

[AD 420] Jerome on Matthew 9:32-35
The Greek word here (κωφὸς) is more frequent in common speech in the sense of 'deaf,' but it is the manner of Scripture to use it indifferently as either.

As the blind receive light, so the tongue of the dumb is loosed, that he may confess Him whom before he denied. The wonder of the multitude is the confession of the nations. The scoff of the Pharisees is the unbelief of the Jews, which is to this day.

[AD 430] Augustine of Hippo on Matthew 9:32-35
(De Cons. Ev. ii. 29.) This account of the two blind men and the dumb dæmon is read in Matthew only. The two blind men of whom the others speak are not the same as these, though something similar was done with them. So that even if Matthew had not also recorded their cure, we might have seen that this present narrative was of a different transaction. And this we ought diligently to remember, that many actions of our Lord are very much like one another, but are proved not to be the same action, by being both related at different times by the same Evangelist. So that when we find cases in which one is recorded by one Evangelist, and another by another, and some difference which we cannot reconcile between their accounts, we should suppose that they are like, but not the same, events.

[AD 533] Remigius of Rheims on Matthew 9:32-35
Observe the beautiful order of His miracles; how after He had given sight to the blind, He restored speech to the dumb, and healed the possessed of the dæmon; by which He shows Himself the Lord of power, and the author of the heavenly medicine. For it was said by Isaiah, Then shall the eyes of the blind be opened, the ears of the deaf shall be unstopped, and the tongue of the dumb loosed. (Is. 35:6.) Whence it is said, When they were gone forth, they brought unto him a man dumb, and possessed with a dæmon.

Thus the Scribes and Pharisees denied such of the Lord's miracles as they could deny; and such as they could not they explained by an evil interpretation, according to that, In the multitude of thy excellency thy enemies shall lie unto thee. (Ps. 66:3.)

For the Gentiles were dumb; not being able to open their mouth in the confession of the true faith, and the praises of the Creator, or because in paying worship to dumb idols they were made like unto them. They were afflicted with a dæmon, because by dying in unbelief they were made subject to the power of the Devil.

They who brought the dumb to be healed by the Lord, signify the Apostles and preachers, who brought the Gentile people to be saved before the face of divine mercy.

[AD 856] Rabanus Maurus on Matthew 9:32-35
The house of the ruler is the Synagogue which was ruled by Moses; the house of Jesus is the heavenly Jerusalem. As the Lord passed through this world and was returning to His own house, two blind men followed Him; that is, when the Gospel was preached by the Apostles, many of the Jews and Gentiles began to follow Him. But when He ascended into Heaven, then He entered His house, that is, into the confession of one faith which is in the Catholic Church, and in that they were enlightened.

Figuratively; As in the two blind men were denoted both nations, Jews and Gentiles, so in the man dumb and afflicted with the dæmon is denoted the whole human race.

[AD 407] John Chrysostom on Matthew 9:35
And so far from punishing them for their insensibility, He did not even simply rebuke them; at once both evincing His meekness, and so refuting the calumny; and at the same time minded also by the signs which followed to exhibit His proof more completely: and then to adduce also the refutation by words. He went about therefore both in cities, and in countries, and in their synagogues; instructing us to requite our calumniators, not with fresh calumnies, but with greater benefits. Since, if not for man's sake, but God's, you do good to your fellow-servants; whatsoever they may do, leave not thou off doing them good, that your reward may be greater; since he surely, who upon their calumny leaves off his doing good, signifies that for their praise' sake, not for God's sake, he applies himself to that kind of virtue.

For this cause Christ, to teach us that of mere goodness He had entered on this, so far from waiting for the sick to come to Him, of Himself hastened unto them, bearing them two of the greatest blessings; one, the gospel of the kingdom; another, the perfect cure of all their diseases. And not a city did He overlook, not a village did He hasten by, but visited every place.
[AD 407] John Chrysostom on Matthew 9:35
Jesus not only refrained from punishing his detractors for their insensitivity, but he did not even give them a simple rebuke. This gives further evidence of his meekness and refutes their malicious talk. He exhibits further proof of his glory by the signs that were to follow and the refutations that would become more explicit. For these reasons he went about in all the cities, in the countryside and in the synagogues, instructing all to respond to those who attacked him, not with fresh vilification but with ever greater benevolence. So do good to your companions not for their sake alone but for God’s sake. Whatever they may do, do not cease doing them good. Your reward will be greater. When you are vilified, if you quit doing good, you signify that you are seeking the praise of others, not the praise of God.For this reason Christ was sent to teach us that he came simply to do good. He did not wait for the sick to come to him. He himself hurried to them, bearing them a twofold blessing: the gospel of the reign of God and the healing of their diseases. And for this he went everywhere, not overlooking the slightest village.

[AD 420] Jerome on Matthew 9:35
(Verse 35.) And Jesus went about all the cities and towns, teaching in their synagogues and preaching the Gospel of the kingdom, and healing all illness and every infirmity. You see that He preached the Gospel equally to both villages and cities, that is, to both large and small, so that He would not consider the power of the nobles, but the salvation of the believers. He went through the cities, having this work that the Father had commanded: and this hunger, to save the unbelievers with His teaching. But He was teaching the Gospel of the kingdom in the synagogues and villages, and after preaching and teaching, He cured every illness and every infirmity, so that those whom his words did not persuade, his deeds would persuade. He is properly called the Lord, who cares for every illness and every infirmity, for nothing is impossible for Him.

[AD 856] Rabanus Maurus on Matthew 9:35
Figuratively; As is the two blind men were denoted both nations, Jews and Gentiles, so in the man dumb and afflicted with the daemon is denoted the whole human race.
[AD 1107] Theophylact of Ohrid on Matthew 9:35
As Lover of mankind He did not wait for them to come to Him, but He Himself went all around. Therefore they could not say as an excuse that "no one taught us." He draws them to Himself by word and deed, teaching and working wonders.