By the middle of the [Eighteenth] century what Nietzsche was later to call a transvaluation of all values was in full blast. Nothing sacred was spared—not even the classical spirit that had been the chief attainment of the Renaissance—and of the ideas and attitudes that were attacked not many survived. It was no longer necessary to give even lip service to the old preposterous certainties, whether theological or political, aesthetic or philosophical. In France, Voltaire, Rousseau and Diderot were making a bonfire of all the ancient Christian superstitions; in England Gibbon was preparing to revive the long dormant art of history and Adam Smith was laying the foundations of the new science of economics; in Germany Kant was pondering an ethical scheme that that would give the Great Commandment a rational basis.