And they were all filled with the Holy Spirit and began to speak in other tongues as the Spirit gave them utterance.
(Acts 2:4 ESV)
As Luke began his retelling of the early church, he points out that this is the continued works of Jesus. In a sense, it’s Luke’s Gospel - Part 2. But there is another major actor in this book. Throughout the book, the Holy Spirit plays a major role beginning on the day of Pentecost. With dramatic fashion, He comes onto the scene in a powerful way.
Depending on your background, the presence, work, and person of the Holy Spirit could be exciting, odd, or expected. You might have grown up reading the KJV and know Him as the Holy Ghost. Or, you might have been a part of a church or movement where the Holy Spirit was seen as a miraculous force that caused people to do weird things and knocked people over - literally. Or, you might see the Spirit as a more subtle suggester, who hints quietly which direction you should go or what you should do.
Before we get too deep into Acts, carrying all of these suppositions into the text, I want to take a brief step back and develop a short theology of the Spirit. This will serve us well to understand who He is (yes - He is a person not a feeling or force). And it will ground us to not only understand the text, but see what regular role He should play in our lives.