[Geology] opens up such wide intellectual vistas and supplies a more perfectly unified and more comprehensive conception of nature than any other science.

The masses are the decisive element, they are the rock on which the final victory of the revolution will be built.

History is the only true teacher, the revolution the best school for the proletariat.

There is no democracy without socialism, and no socialism without democracy.

Friedrich Engels once said: "Bourgeois society stands at the crossroads, either transition to socialism or regression into barbarism." What does "regression into barbarism" mean to our lofty European civilization? Until now, we have all probably read and repeated these words thoughtlessly, without suspecting their fearsome seriousness. A look around us at this moment shows what the regression of bourgeois society into barbarism means. This world war is a regression into barbarism. The triumph of imperialism leads to the annihilation of civilization.

The most revolutionary thing one can do is always to proclaim loudly what is happening.

Being human means throwing your whole life on the scales of destiny when need be, all the while rejoicing in every sunny day and every beautiful cloud.