In the eyes of dialectical philosophy, nothing is established for all times, nothing is absolute or sacred.

Darwin's book is very important and serves me as a basis in natural science for the class struggle in history. One has to put up with the crude English method of development, of course. Despite all deficiencies not only is the death-blow dealt here for the first time to 'teleology' in the natural sciences, but their rational meaning is empirically explained.

[Napoleon] swept away everywhere the establishments of feudality. ... [He was] Caesar himself.

Crack-brained meddling by the authorities [can] aggravate an existing crisis.

The unity of the bourgeoisie can be shaken only by the unity of the proletariat.

...the very cannibalism of the counterrevolution will convince the nations that there is only one way in which the murderous death agonies of the old society and the bloody birth throes of the new society can be shortened, simplified and concentrated, and that way is revolutionary terror.

The traditions of the dead generations weigh like a nightmare upon the living.