With the true artist, the social formula that he recommends is a matter of secondary importance; the source of his art, its animating spirit, is decisive.

The masses are in reality their own leaders, dialectically creating their own development process.

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

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

Marxism must abhor nothing so much as the possibility that it becomes congealed in its current form. It is at its best when butting heads in self-criticism, and in historical thunder and lightning, it retains its strength.

Those who do not move, do not notice their chains.

Marxism is a revolutionary worldview that must always struggle for new revelations.