(a) The disciples were together in one place on the day of Pentecost, when a sound came from heaven and filled the Suddenly there appeared on their heads tongues as of fire. The disciples were filled with Holy spirit and they as the spirit led them. Various people who dwelt in Jerusalem as well as the disciples also spoke in tongues. people who heard them were amazed, and were forced to asked whether the disciples were not all Galileans and wondered why they all spoke in diverse tongues. Some by standers mocked them that the disciples were drunk. .
(b) Through the Holy spirit, active evangelism still goes on today. Former citadels of atheism are crumbling giving way to acceptance of the Gospel. The Holy spirit is still assisting the world which has gone crazy with hatred, envy, man's inhumanity to man, indiscipline, murder, corruption. etc, The Holy Spirit, is recognized as the lonely voice in the wilderness, appealing to human conscience to be more humane and ensure survival of human race. The Holy Spirit, is helping through the building of hospital, homes for poor and aged. In spite of economic recessions, the Holy spirit still des the church with the strength to carry on. Through the Holy Spirit miracle of healing are daily being recorded in Churches and hospitals.