In Acts 2 the Holy Spirit does come upon [the apostles], revealing four things about revival: One, revival is miraculous (verses 1-4). Humanly uncaused. “Suddenly there came from heaven” (verse 2). Two, revival is mysterious (verses 5-13). Humanly inexplicable. “What does this mean?” (verse 12). Three, revival is meaningful (verses 14-36). Humanly undeniable. “Men of Israel, hear these words: Jesus of Nazareth” (verse 22). Four, revival is mighty (verses 37-41). Humanly irresistible. “There were added that day about three thousand souls” (verse 41).