Its character is primarily materialistic. In contradistinction to the idealist systems of the most flourishing time of German philosophy which considered the Mind as the basis of all existence, it starts from concrete materialist being. Not that it regards mere physical matter as its basis; it is rather opposed to the crude bourgeois materialism, and matter to it means everything which exists and furnishes material for thought, including thoughts and imaginations. Its foundation is the unity of all concrete being. Thus it assigns to the human mind an equal place among the other parts of the universe; it shows that the mind is as closely connected with all the other parts of the universe as those parts are among themselves; that is to say, the mind exists only as a part of the entire universe so that its content is only the effect of the other parts. Thus our philosophy forms the theoretical basis of historical materialism. While the statement that "the consciousness of man is determined by his social life" could hitherto at best be regarded as a generalization of many historical facts and thus seemed imperfect and open to criticism, capable of improvement by later discoveries, the same as all other scientific theories, henceforth the complete dependence of the mind on the rest of the world becomes as impregnable and immutable a requirement of thought as causality. This signifies the thorough refutation of the belief in miracles. After having been banished long ago from the field of natural science, miracles were now banished from the domain of thought. The enlightening effect of this proletarian philosophy consists furthermore in its opposition to all superstition and its demonstration of the senselessness of all idol worship. Socialist understanding accomplished something which the bourgeois reformers could not do, because they were limited to natural science in a narrow sense and could not solve the mystery of the mind; for in explaining all the mental, spiritual phenomena as natural phenomena our proletarian philosophy furnishes the means for a trenchant critique of Christian faith which consists in the belief in a supernatural spiritual being. In his dialectic discussions of mind and matter, finiteness and infinity, god and the world, Dietzgen has thoroughly clarified the confused mystery which surrounded these conceptions and has definitely refuted all transcendental beliefs. And this critique is no less destructive for the bourgeois idols: Freedom, Right, Spirit, Force, which are shown to be but fantastic images of abstract conceptions with a limited validity.