As indicated in the book Three Books, the Bible book of Acts is commonly known as the Acts of the Apostles. The Apostles are certainly the primary human actors in the narrative, but it is really the story of the Holy Spirit of God glorifying Jesus Christ, and building His church. One of the purpose of highlighting the references to the Holy Spirit is to draw attention to this fact.
Further we should note that the Holy Spirit is not “a spirit,” as we might say someone “that they are spiritual” or “their spirit moves them.” The Holy Spirit is God, a being that is the third person of the Trinity. There is but one God, yet there are three persons. The Scriptures cannot be reasonable understood any other way, though it does not make sense to our natural minds because it is not our ordinary experience. But, of course, we are dealing with the God Himself, so what “makes sense” to us is not the standard of truth.
Physical journeys are a prevalent theme in Acts. What may not have been apparent in reading John, which itself had numerous journeys, is how narrowly confined the geography of all the Gospels is: north to south less than 200 miles, and east to west less than 100 mies. In contrast, in Acts we find the physical journeys expanding primarily outside the land of Israel into the far reaches of the then vast Roman empire, ending with the Apostle Paul’s arrival in Rome to be tried by Caesar. The trial itself, nor its outcome is included in the Bible for reasons, we have to understand, that it is not particularly important to God’s narrative how and when Paul died, nor the other apostles.
The many and extensive physical journeys in Acts makes clearer the vastness of the inner, spiritual journey that was to be undertaken. Many Jewish faithful followers of Mosaes had to be shaken to their core, as was Saul later becoming Paul, for God to bring them to faith. As remarkable, or even more remarkable, was the conversion journey of the Roman citizens. Christianity was a prohibited religion at that time. In Acts, the martyrs (such as Stephen) was killed by the opposition to Christ and any message of his resurrection by the followers of the Mosaic Law. However, from numerous extra-Bibilcial accounts we know of hundreds of early Christian believers, including almost every one of the Apostles, was martyred for their faith and message. The religion of Rome was foremost the worship of their ruler, a Caesar, who was elevated to god like status. In addition to Caesar, but far more numerous were the pagan gods. These were a crazy admixture of pagan gods from the ancient Greeks, who had been conquered but culturally absorbed by the Romans. In addition, and in parallel to the pagan Greek pantheon of gods, there were numerous Roman gods and worship patterns. Into this less than fertile field–humanly speaking–great inner spiritual journeys are found in the book of Acts.