If it is true, as I think it is, that the Church on Earth will never be a perfect embodiment of the Kingdom of Heaven, in what sense can we say the words of the Lord’s Prayer: ‘Thy Kingdom come, Thy will be done in Earth as it is in Heaven’? Have we been right, after all, in coming to the conclusion that –in contrast to the cyclic movement of the rises and falls of civilizations– the history of religion on Earth is a movement in a single continuous upward line? What are the matters in which there has been, in historical times, a continuous religious advance? And have we any reason to think that this advance will continue without end? Even if the species of societies called civilizations does give way to a historically younger and perhaps spiritually higher species embodied in a single world- wide and enduring representative in the shape of the Christian Church, may there not come a time when the tug of war between Christianity and original sin will settle down to a static balance of spiritual forces?