Now here comes in the whole collapse and huge blunder of our age. We have mixed up two different things, two opposite things. Progress should mean that we are always changing the world to suit the vision. Progress does mean (just now) that we are always changing the vision. It should mean that we are slow but sure in bringing justice and mercy among men: it does mean that we are very swift in doubting the desirability of justice and mercy: a wild page from any Prussian sophist makes men doubt it. Progress should mean that we are always walking towards the New Jerusalem. It does mean that the New Jerusalem is always walking away from us. We are not altering the real to suit the ideal. We are altering the ideal: it is easier.
G.K. Chesterton, Orthodoxy, pg.101-102