After they had set a day to meet with him, they came to him at his lodgings in great numbers. From morning until evening he explained the matter to them, testifying to the kingdom of God and trying to convince them about Jesus both from the law of Moses and from the prophets. Some were convinced by what he had said, while others refused to believe. So they disagreed with each other; and as they were leaving, Paul made one further statement: “The Holy Spirit was right in saying to your ancestors through the prophet Isaiah,
‘Go to this people and say,
You will indeed listen, but never understand,
and you will indeed look, but never perceive.
For this people’s heart has grown dull,
and their ears are hard of hearing,
and they have shut their eyes;
so that they might not look with their eyes,
and listen with their ears,
and understand with their heart and turn—
and I would heal them.’
Let it be known to you then that this salvation of God has been sent to the Gentiles; they will listen.”
He lived there two whole years at his own expense and welcomed all who came to him,31 proclaiming the kingdom of God and teaching about the Lord Jesus Christ with all boldness and without hindrance.
— Acts 28.23-31
What a thesis statement for all of Paul’s ministry and the books of Luke: the hard-heartedness of the Jews and the inclusion of the Gentiles. Perhaps this was a main reason why Luke wrote both of these books to the mysterious Theophilus. Maybe he wrote these to offer assurance to this Gentile man (as evidenced by his Roman name) of his inclusion in the mission and salvation of God.
On a side note, it’s odd that this statement of the Gentile inclusion in the family of God (throughout Paul’s preaching) rests primarily on the a story of the preaching ministry of Paul. It’s well-known that Luke draws literary parallels between Jesus in the Gospel of Luke and Paul in Acts. But since this was being written to Theophilus, and these writings about Paul seem to rest on an implied authority and trust that it seems Theophilus would have had in Paul (if he said it, then it must be true), then could this be a hint that Theophilus met Paul at some point or even that Paul was the one that converted him?
Just a thought. A pure, conjectural thought.