In order to justify himself completely he must point to the way he furthers progress by improving the modes of production, by lowering the prices of consumption, by establishing intercourse between nations. A rich man must think and speak in scientific language, and, like the clergy formerly, he must offer sacrifices to the ruling class: he must publish magazines and books, provide himself with a picture-gallery, a musical society, a kindergarten or technical school. The ruling class is the class of learned men and artists of a definite character. They possess the complete justification for having freed themselves from labour; and on this justification (as in former times on the theological justification, and afterwards on the philosophical one) everything is based: and it is these men who now give the diploma of exemption to other classes. The class of men who now feel completely justified in freeing themselves from labour, is that of men of science, and particularly of experimental, positive, critical, evolutional science, and of artists who develop their ideas according to the same tendency. If a learned man or an artist of the old style speaks nowadays about prophecy, revelation, or the manifestation of the spirit, he does so because he is behind the age, and he will not succeed in justifying himself: to stand firm he must try to associate his activity with experimental, positive, critical science, and he must make this science the fundamental principle of his activity. Only then will the science or the art with which he is occupied appear true, and he will stand on firm ground, and then there will be no doubt as to his usefulness to mankind. The justification of all who have freed themselves from labour is now based upon this experimental, critical, positive science. The theological and philosophical explanations have had their day: now they timidly and bashfully introduce themselves to notice and try to humour their scientific usurper, who, however, boldly knocks down and destroys the remnants of the past, everywhere taking its place, and, assured of its own firmness, lifts aloft its head. _The theological justification_ maintained that men are predestined,--some to govern, others to obey; some to live sumptuously, others to labour: and therefore those who believed in the revelation of God could not doubt the lawfulness of the position of those men, who, by the will of God, are called to govern and to be rich. _The state-philosophical justification_ used to say, "The state with all its institutions and differences of classes according to rights and possessions, is that historical form which is necessary for the right manifestation of the spirit in mankind; and therefore the situation which everyone occupies in state and in society according to his rights and to his possessions must be such as to ensure the sound life of mankind."