"But you only furnish a different definition of arts and sciences, which is stricter, and is incompatible with science," I shall be told in answer to this; "nevertheless, scientific and artistic activity does still exist. There are the Galileos, Brunos, Homers, Michael Angelos, Beethovens, and all the lesser learned men and artists, who have consecrated their entire lives to the service of science and art, and who were, and will remain, the benefactors of mankind." Generally this is what people say, striving to forget that new principle of the division of labor, on the basis of which science and art now occupy their privileged position, and on whose basis we are now enabled to decide without grounds, but by a given standard: Is there, or is there not, any foundation for that activity which calls itself science and art, to so magnify itself? When the Egyptian or the Grecian priests produced their mysteries, which were unintelligible to any one, and stated concerning these mysteries that all science and all art were contained in them, I could not verify the reality of their science on the basis of the benefit procured by them to the people, because science, according to their assertions, was supernatural. But now we all possess a very simple and clear definition of the activity of art and science, which excludes every thing supernatural: science and art promise to carry out the mental activity of mankind, for the welfare of society, or of all the human race. The definition of scientific science and art is entirely correct; but, unfortunately, the activity of the present arts and sciences does not come under this head. Some of them are directly injurious, others are useless, others still are worthless,--good only for the wealthy. They do not fulfil that which, by their own definition, they have undertaken to accomplish; and hence they have as little right to regard themselves as men of art and science, as a corrupt priesthood, which does not fulfil the obligations which it has assumed, has the right to regard itself as the bearer of divine truth. And it can be understood why the makers of the present arts and sciences have not fulfilled, and cannot fulfil, their vocation. They do not fulfil it, because out of their obligations they have erected a right. Scientific and artistic activity, in its real sense, is only fruitful when it knows no rights, but recognizes only obligations. Only because it is its property to be always thus, does mankind so highly prize this activity. If men really were called to the service of others through artistic work, they would see in that work only obligation, and they would fulfil it with toil, with privations, and with self-abnegation.