F. Bacon, Comenius, Marx, Engels, Otto Hausner

And what else could be expected? In the 8th–9th century, when men sat together at night around a fire in the forest, they spoke in quite a different style from that customary in the 19th century, when Hegel had lived, when things were settled by dialectic. Try all the same to picture to yourselves the forest in north-eastern France in the 9th century. There sit the conspirators, cursing, railing in the language of the period. Translate it into the mathematical-dialectical mode of speech of the 19th century, and you have what comes to expression in Marx and Engels.