“It seems to me, in reflecting upon the progress of moral thinking down the ages, especially on those moments when the moral wisdom of a society evolves decisively and reverses or notably qualifies previously held moral principles, that what usually happens is that a wider context of reality with new relevant consequences comes into focus, or that it becomes recognized that the previous judgments were made from too narrow a value perspective, subordinating a higher but less apparent value to a more immediately evident shorter-range one.”
~ W. Norris Clarke, Conscience: Its Freedom and Limitations
