According to the Bible, we are to be living a supernatural life now, in this present existence, in a way we shall never be able to do again through all eternity. We are called upon to live a supernatural life now, by faith. Eternity will be wonderful, but there is one thing heaven will not contain, and that is the call, the possibility, and the privilege of living a supernatural life here and now by faith before we see Jesus face-to-face. This is the demonstration that God intends in the world until Christ returns, and it is the Christian who is to be the demonstration. Christians are called upon to be a demonstration at our point of history that the supernatural, the normally unseen world, does exist and, beyond that, that God exists. They are to do this individually and corporately, each generation of Christians to their own generation.
An excerpt from True Spirituality by Francis Shaeffer