CS Lewis on Progress and an Absolute Good
Does a permanent moral standard preclude progress? On the contrary, except on the supposition of a changeless standard, progress is impossible. If good is a fixed point, it is at least possible that we should get nearer and nearer to it; but if the terminus is as mobile as the train, how can the train progress towards it? Our ideas of the good may change, but they cannot change either for the better or the worse if there is no absolute and immutable good to which they can recede. We can go on getting a sum more and more nearly right only if the one perfectly right is “stagnant”.