Eighteenth-century man was the man who could no longer remain ignorant of the significance of the fact that Copernicus and Galileo were right, that this vast and rich earth of his, the theatre of his deeds was not the centre of the universe, but a grain of dust amid countless others in this universe, and who clearly saw the consequences of all this. What did this really apocalyptic revolution in his picture of the universe mean for man? An unprecedented and boundless humiliation of man? No, said the man of the eighteenth century, who was not the first to gain this knowledge, but certainly the first to realize it fully and completely; no, man is all the greater for this, man is in the centre of all things, in a quite different sense, too, for he was able to discover this revolutionary truth by his own resources and to think it abstractly, again to consider and penetrate a world which had expanded overnight into infinity—and without anything else having changed, without his having to pay for it in any [24] way: clearly now the world was even more and properly so his world! It is paradoxical and yet it is a fact that the answer to his humiliation was those philosophical systems of rationalism, empiricism and scepticism which made men even more self-confident. The geocentric picture of the universe was replaced as a matter of course by the anthropocentric.

— Karl Barth, Protestant Theology in the Nineteenth Century: Its Background and History, 23–24