Before Jesus ascended to heaven, he told his disciples to go back to Jerusalem and wait. They were about to receive an amazing gift: the baptism of the Holy Spirit. A few days later, during the Jewish festival of Pentecost, the Spirit came . . . and he didn’t come quietly. He arrived in wind and fire. Suddenly the believers began speaking in other tongues. Jews from all over the Roman Empire had gathered in Jerusalem for the festival—and each of them heard the believers speak to them in their own language! Then Peter got up to speak. He reminded the crowd that hundreds of years earlier, the prophet Joel had predicted that God’s Spirit would come. Peter proclaimed Jesus’ death and resurrection. The crowd, cut to the heart, responded, “What shall we do?” Peter said the proper response would be to repent, be baptized, and receive the gift of the Holy Spirit. In other words, it is impossible to live the Christian life apart from the power and presence of the Holy Spirit. From the moment we are born again, God’s Spirit supplies the power we need to be a consistent witness for Christ.