2 And what may be the reason that Matthew said not at the beginning, in the same way as the prophet, “the vision which I saw,” and “the word which came unto me”? Because he was writing unto men well disposed, and exceedingly attentive to him. For both the miracles that were done cried aloud, and they who received the word were exceeding faithful. But in the case of the prophets, there were neither so many miracles to proclaim them; and besides, the tribe of the false prophets, no small one, was riotously breaking in upon them: to whom the people of the Jews gave even more heed. This kind of opening therefore was necessary in their case.
And if ever miracles were done, they were done for the aliens' sake, to increase the number of the proselytes; and for manifestation of God's power, if haply their enemies having taken them captives, fancied they prevailed, because their own gods were mighty: like as in Egypt, out of which no small “mixed multitude” went up; and, after that, in Babylon, what befell touching the furnace and the dreams. And miracles were wrought also, when they were by themselves in the wilderness; as also in our case: for among us too, when we had just come out of error, many wonderful works were shown forth; but afterwards they stayed, when in all countries true religion had taken root.
And what took place at a later period were few and at intervals; for example, when the sun stood still in its course, and started back in the opposite direction. And this one may see to have occurred in our case also. For so even in our generation, in the instance of him who surpassed all in ungodliness, I mean Julian, many strange things happened. Thus when the Jews were attempting to raise up again the temple at Jerusalem, fire burst out from the foundations, and utterly hindered them all; and when both his treasurer, and his uncle and namesake, made the sacred vessels the subject of their open insolence, the one was “eaten with worms, and gave up the ghost,” the other “burst asunder in the midst.” Moreover, the fountains failing, when sacrifices were made there, and the entrance of the famine into the cities together with the emperor himself, was a very great sign. For it is usual with God to do such things; when evils are multiplied, and He sees His own people afflicted, and their adversaries greatly intoxicated with their dominion over them, then to display His own power; which he did also in Persia with respect to the Jews.
Source: Homilies on the Gospel of St. Matthew (New Advent)