The whole struggle of our Party (and of the working class movement in Europe generally) must be directed against opportunism. The latter is not a current of opinion, not a tendency; it (opportunism) has now become the organised tool of the bourgeoisie within the working class movement.

But democracy is by no means a limit one may not overstep; it is only one of the stages in the course of development from feudalism to capitalism, and from capitalism to Communism.

The press should be not only a collective propagandist and a collective agitator, but also a collective organizer of the masses.

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.

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

False rhetoric and false boastfulness spell moral ruin and lead unfailingly to political extinction.

Attention, must be devoted principally to raising the workers to the level of revolutionaries; it is not our task to descend to the level of the 'working masses'.