When Jesus heard it, he marveled, and said to them that followed,
Verily I say unto you, I have not found so great faith, no, not in Israel.
Read Chapter 8
Augustine of Hippo
AD 430
Now this man was a Gentile—he was, after all, a centurion. The Jewish nation already had troops of the Roman Empire among them. This man was in command of troops there, to the extent that a centurion could be in command. He was under authority, and he had authority. As a subordinate, he was obedient; as having subordinates, commanding. … Even if the Lord did not enter bodily into this man’s house, yet he was already so present in majesty that he healed his faith and his servant. Yet the same Lord had appeared in bodily presence among his own covenant people. He was not born in some other country. He did not suffer or walk or endure his human sufferings or do wonders in some other nation. None of all this took place in other nations. Yet through the centurion the prophecy was fulfilled that was spoken of him: “A people whom I have not known has served me.” And how did the centurion know him? By “obeying me with the hearing of the ear.”
Christ here compares the faith of the centurion with that of the people in general, and not with that of his blessed mother and the apostles, whose faith was beyond a doubt much greater. (Menochius)
The Greek says, "neither in Israel. "
Jesus hearing this, marvelled. That is, by his outward carriage, says St. Augustine seemed to admire: but knowing all things, he could not properly admire any thing.
I have not found so great faith in Israel. This need not be understood of every one, but of those whom he had cured. (Witham)
Jesus is found marveling at the centurion. He turns his attention to him and honors him with the gift of the kingdom. He calls others to the same zeal. The Gospel of Matthew, Homily
It follows, that to have high imaginations concerning Him, this especially is of faith, and tends to procure the kingdom and His other blessings. For neither did His praise reach to words only, but He both restored the sick man whole, in recompence of his faith, and weaves for him a glorious crown, and promises great gifts.
The centurion says, "If I who am the servant of the emperor command the soldiers who are under me, how much more so art Thou able to command death and the illnesses, so that they depart from one and beset another?" For illnesses of the body are God’s soldiers and officers of punishment. Christ marvels, therefore, saying, "I have not found such great faith among the Israelites as I have in this Gentile."