The natural scientist must be a modern materialist, a conscious adherent of the materialism represented by Marx, i.e., he must be a dialectical materialist.

You can become a Communist only when you enrich your mind with a knowledge of all the treasures created by mankind.

It is stupid to tolerate Nikola; all Chekists have to be on alert to shoot anyone who doesn't turn up to work because of Nikola.

Whenever the cause of the people is entrusted to professors, it is lost.

We would be deceiving both ourselves and the people if we concealed from the masses the necessity of a desperate, bloody war of extermination, as the immediate task of the coming revolutionary action.

Despair is typical of those who do not understand the causes of evil, see no way out, and are incapable of struggle. The modern industrial proletariat does not belong to the category of such classes.

I don't care what becomes of Russia. To hell with it. All this is only the road to a World Revolution.