The second specific limitation of this materialism lay in its inability to comprehend the universe as a process, as matter undergoing uninterrupted historical development. This was in accordance with the level of the natural science of that time, and with the metaphysical, that is, anti-dialectical manner of philosophising connected with it. Nature, so much was known, was in eternal motion. But according to the ideas of that time, this motion turned, also eternally, in a circle and therefore never moved from the spot; it produced the same results over and over again. This conception was at that time inevitable. The Kantian theory of the origin of the Solar System (that the Sun and planets originated from incandescent rotating nebulous masses) had been put forward but recently and was still regarded merely as a curiosity. The history of the development of the Earth, geology, was still totally unknown, and the conception that the animate natural beings of today are the result of a long sequence of development from the simple to the complex could not at that time scientifically be put forward at all. The unhistorical view of nature was therefore inevitable. We have the less reason to reproach the philosophers of the 18th century on this account since the same thing is found in Hegel. According to him, nature, as a mere “alienation” of the idea, is incapable of development in time — capable only of extending its manifoldness in space, so that it displays simultaneously and alongside of one another all the stages of development comprised in it, and is condemned to an eternal repetition of the same processes. This absurdity of a development in space, but outside of time — the fundamental condition of all development — Hegel imposes upon nature just at the very time when geology, embryology, the physiology of plants and animals, and organic chemistry were being built up, and when everywhere on the basis of these new sciences brilliant foreshadowings of the later theory of evolution were appearing (for instance, Goethe and Lamarck). But the system demanded it; hence the method, for the sake of the system, had to become untrue to itself.

Friedrich Engels, Ludwig Feuerbach and the End of Classical German Philosophy, 1886

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