The Acts of the Apostles, from 70-90 CE, has been associated with Luke, the gospel writer. This book described the activities of the early Christians in their various missionary efforts. The Book of Revelation, from around 70-100 CE, is apocalyptic in nature, as it describes the end times. Some have claimed that this belongs to John, the apostle. Both these books emphasize the role of the Christian community as it developed and what might happen to it in the future.