At first blush there doesn't seem to be a whole lot of meat here. Three teeny tiny verses. A recap of Luke 24.
At a kind of critical level what jumps out at me is:
Theophilus. Theophilus means lover of God. It could be a proper name. It could be a term used for initiates for baptism or a name used in the faith communities Luke worked in for fellow followers of the Way (i.e., Christians). There were also in ancient times a significant number of pagans who basically converted to Judaism yet for various reasons refused to take full circumcision and I seem to remember but cannot confirm from any books on my shelf that these folks were referred to by the Jews as god-lovers.
Why is this important (to me?). Because I tend I try to be mindful of who the intended or
ideal reader of a book is. I think it gives me perspective and limits the range of interpretations I might bring. To a certain extent a text like this is something I cannot claim to own but rather borrow and so I have a kind of obligation to Luke in this regard.
So questions raised here: Is this a book for seasoned members of the faith? For prospective initiates -- like handing a book on the background of Quakerism to someone interested in joining your meeting? Or is this a tract for curious outsiders?
The other words which jump out at me, for very different reasons:
he gave his instructions, through the Holy Spirit, to the special messengers of his choice.
Interesting a whole mess of ways. The apostles had access to Jesus' instructions through the Holy Spirit
before Pentecost. Is this a recap of Luke 24 or is this new information?
Luke 24:32. They said to each other, "Were not our hearts burning within us while he was talking to us on the road, while he was opening the scriptures to us?"
Luke 24:46. and he said to them, "Thus it is written, that the Messiah is to suffer and to rise from the dead on the third day.
His disciples, the ones he personally trained during his earthly life, needed a resurrected Christ to instruct them in the meanings of both their current situation and in the meaning of the scriptures that point towards that present situation. And he does so through the Holy Spirit (Acts 1:2).