People generally do things for reasons, especially if it is something that takes a significant amount of time. The reason may not be well thought out, but if you are going to a great deal of effort, you likely have a reason for doing so!
The apostles chose to obey Christ, and the Spirit came. Listeners chose to respond to Peter's teaching, and they were saved. The apostles continued to choose following God with their lives, and when the power structure threatened to cut their lives short, they pressed on with what God called them to do. People were saved, their lives were spared, and the church grew.
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