The evangelist Matthew leads his account very consistently. Having told us in chapter 4 what Jesus' public ministry consisted of...
The evangelist Matthew leads his account very consistently. Having told us in chapter 4 what Jesus' public ministry consisted of, remember: the preaching of the Gospel of the Kingdom, healing, and the building of the Church, he gives an example of the preaching in chapters 5-7, and now tells about healings and other miracles.
There were many miracles, and Matthew selects for his account those that seem to him most revealing and important for a Jewish reader. In the healing of the leper, the significant moments are Jesus' touch of the sick man; one must not touch a leper!; and the command to show himself to the priest and offer the sacrifice. Jesus does not neglect the law of Moses, but surpasses it by mercy. In the case of the centurion, Jesus communicates with a Gentile; one must not associate with Gentiles!; but what, in fact, distinguishes a Gentile from a Jew? Faith. And the Lord shows that the centurion's living faith is stronger than Israel's traditional and bookish faith.
We see that the miracles are performed by Him not at random, but as a continuation of His preaching, and the apostle Matthew, as is his custom, gives an Old Testament foundation for this ministry of Jesus with a passage from the famous 53rd chapter of Isaiah.