The position in which the Church would then find herself is well conveyed in Plato‘s conceit, in the Phaedo, of the true surface of the Earth. We live, Plato suggests, in a large but local hollow, and what we take to be the air is really a sediment of fog. If one day we could make our way to the upper levels of the surface of the Earth, we should there breathe the pure ether and should see the light of the Sun and stars direct; and then we should realize how dim and blurred had been our vision down in the hollow, where we see the heavenly bodies, through the murky atmosphere in which we breathe, as imperfectly as the fishes see them through the water in which they swim. This Platonic conceit is a good simile for the life of the Church Militant on Earth; but the truth cannot be put better than it has been by Saint Augustine.
” It is written of Cain that he founded a commonwealth; but Abel –true to the type of the pilgrim and sojourner that he was– did not do the like. For the Commonwealth of the Saints is not of this world, though it does give birth to citizens here in whose persons it performs its pilgrimage until the time of its kingdom shall come–the time when it will gather them all together.” (Saint Augustine: De Civitate Dei, Book XV, chap. i 13)
This brings me in conclusion to the last of the topics on which I am going to touch, that of the relation between Christianity and progress.
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?
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