According to Luke, something happened on the Pentecost following Jesus’ death, resurrection, ascension. He records Peter and the other followers of Jesus telling everyone who would listen that the Holy Spirit had come, just as God has promised. Peter said that the same promise was available to all who repented and were baptized in the name of Jesus.
Needless to say… this was something different… something new.
Today, the promised Holy Spirit is still given to God’s children. Being indwelled by the Spirit makes us different, both individually and when we’re together. Our lives (personally and corporately) should demonstrate this difference.
We should be different than we were before we were indwelled by the Spirit, and we should be different than the people and groups around us who are not indwelled by the Spirit.