p As the most comprehensive and profound doctrine of development, and the richest in content, Hegelian dialectics was considered by Marx and Engels the greatest achievement of classical German philosophy. They thought that any other formulation of the principle of development, of evolution, was one-sided and poor in content, and could only distort and mutilate the actual course of development (which often proceeds by leaps, and via catastrophes and revolutions) in Nature and in society. "Marx and I were pretty well the only people to rescue conscious dialectics [from the destruction of idealism, including Hegelianism] and apply it in the materialist conception of Nature.... Nature is the proof of dialectics, and it must be said for modern natural science that it has furnished extremely rich [this was written, before the discovery of radium, electrons, the transmutation of elements, etc.!] and daily increasing materials for this test, and has thus proved that in the last analysis Nature’s process is dialectical and not metaphysical.”^^11^^

p “The great basic thought," Engels writes, "that the world is not to be comprehended as a complex of ready-made things, but as a complex of processes, in which the things apparently stable no less than their mind images in our heads, the concepts, go through an uninterrupted change of coming into being and passing away ... this great fundamental thought has, especially since the time of Hegel, so thoroughly permeated ordinary consciousness that in this 17 generality it is now scarcely ever contradicted. But to acknowledge this fundamental thought in words and to apply it in reality in detail to each domain of investigation are two different things.... For dialectical philosophy nothing is final, absolute, sacred. It reveals the transitory character of everything and in everything; nothing can endure before it except the uninterrupted process of becoming and of passing away, of endless ascendancy from the lower to the higher. And dialectical philosophy itself is nothing more than the mere reflection of this process in the thinking brain." Thus, according to Marx, dialectics is "the science of the general laws.of motion, both of the external world and of human thought",^^12^^

p This revolutionary aspect of Hegel’s philosophy was adopted and developed by Marx. Dialectical materialism "does not need any philosophy standing above the other sciences". From previous philosophy there remains "the science of thought and its laws—formal logic and dialectics".^^13^^ Dialectics, as understood by Marx, and also in conformity with Hegel, includes what is now called the theory of knowledge, or epistemology, which, too, must regard its subject matter historically, studying and generalising the origin and development of knowledge, the transition from raon-knowledge to knowledge .-

In our times the idea of development, of evolution, has almost completely penetrated social consciousness, only in other ways, and not through Hegelian philosophy. Still, this idea, as formulated by Marx and Engels on the basis of Hegel’s philosophy, is far more comprehensive and far richer in content than the current idea of evolution is. A development that repeats, as it were, stages that have already been passed, but repeats them in a different way, on a higher basis ("the negation of negation"), a development, so to speak, that proceeds in spirals, not in a straight line; a development by leaps, catastrophes, and revolutions; "breaks in continuity"; the transformation of quantity into quality; inner impulses towards development, imparted by the contradiction and conflict of the various forces and tendencies acting on a given body, or within a given phenomenon, or within a given society; the interdependence and the closest and indissoluble connection between all aspects 18 of any phenomenon (history constantly revealing ever new aspects), a connection that provides a uniform, and universal process of motion, one that follows definite laws—these are some of the features of dialectics as a doctrine of development that is richer than the conventional one. (Gf. Marx’s letter to Engels of January 8, 1868, in which he ridicules Stein’s "wooden trichotomies", which it would be absurd to confuse with materialist dialectics.)