Thus the historical progress of religion in this world, as represented by the rise of the higher religions and by their culmination in Christianity, may, and almost certainly will, bring with it, incidentally, an immeasurable improvement in the conditions of human social life on Earth; but its direct effect and its deliberate aim and its true test is the opportunity which it brings to individual souls for spiritual progress in this world during the passage from birth to death. It is this individual spiritual progress in this world for which we pray when we say ‘Thy will be done in Earth as it is in Heaven.’ It is for the salvation that is open to all men of good will –pagan as well as Christian, primitive as well as civilized– who make the most of their spiritual opportunities on Earth, however narrow these opportunities may be, that we pray when we say ‘Thy Kingdom come.’

From Civilization on Trial, Oxford University Press, 1948.