As Jesus is the cornerstone upon which the Church is built, so are his teachings the unifying cornerstone of Christian doctrine.
In Mark 13:24-37 we are told to keep awake, to stay alert. As we think of Advent, the coming of Christ in the flesh, it is also good to remember that he will come again. Every generation of Christians has generated its false prophets who claim to know the day or hour of Christ’s return, but they have all proven wrong. Few of them have admitted it. Our duty to God is not in prediction, but in being ready, because we don’t know when Jesus will return. Rather than getting caught up in prophetic speculation our job it to stay awake. What must we do to be ready for his return? What would we change if we knew he would come tomorrow? Ought not our readiness be the same as if he were coming tomorrow, because someday he will?