Second Coming
The Second Coming (sometimes called the Second Advent or the Parousia) is a Christian and Islamic belief regarding the future (or past) return of Jesus Christ after his ascension to heaven about two thousand years ago. The idea is based on messianic prophecies and is part of most Christian eschatologies.
Gospel of Mark
Christians of Mark's time expected Jesus to return as Messiah in their own lifetime – Mark, like the other gospels, attributes the promise to Jesus himself (Mark 9:1 and 13:30), and it is reflected in the letters of Paul, in the epistle of James, in Hebrews, and in Revelation. When return failed, the early Christians revised their understanding. Some acknowledged that the Second Coming had been delayed, but still expected it; others redefined the focus of the promise, the Gospel of John, for example, speaking of "eternal life" as something available in the present; while still others concluded that Jesus would not return at all (2 Peter argues against those who held this view).