The first perversion of the doctrine of the second coming of Christ is perpetrated by those I'm going to call "prophecy mongers." You know these people. They come with their charts and graphs, with their predictions and projections, claiming to have special insight into the workings of God in the world, so that they're able to cue us in on just where we are in the divine timetable. And somehow, every political event of the past fifty years fits neatly into their scheme of things. But Jesus said that no one not even himself knew the day or the hour of his coming, but only the Father.
But there is another distortion of this doctrine that is equally vitiating although in comes from a completely different direction. Here I refer to those who, far from exaggerating the eschatology of Jesus, want to minimize it because they are embarrassed. They rationalize it or demythologize it or spiritualize it, so that they can embrace Jesus and his teachings without getting all the supernatural trimmings that go with it. The fundamentalist and the rationalist share a common assumption about the second coming. They both assume that this is teaching we can easily understand and exploit and have at our disposal, so that it no longer threatens us, no longer hangs over our heads like Damocles's word, ready to fall upon us and shatter our pretty pretensions into a thousand smithereens. The fundamentalist over explains the second coming, and so takes away its mystery, while the rationalist explains it away, robbing it of its meaning.
Jesus said, "Keep watch, because you do not know the day or the hour." It is here at the point of waiting that most of us have our greatest difficulty.