The book of Acts was written by Luke the beloved physician and evangelist. I believe this book is very important because it not only tells us about the teachings of Jesus and conquering death but about his command to the disciples to preach the gospel and to wait for the Holy Spirit. On the day of Pentecostal his disciples and everyone present received the Holy Spirit which gave them the ability to speak in other languages. The Holy Spirit gave them power to witness in Jerusalem, Judea and the uttermost part of the earth. The Holy Spirit is not only dwelling and given power to witness today but he is guiding and comforting us also.