The whole struggle of our ...

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.
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.
 Vladimir Lenin

Quotes from the same author

Russians are too kind, they lack the ability to apply determined methods of revolutionary terror.
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 Vladimir Lenin
Only struggle educates the exploited class. Only struggle discloses to it the magnitude of its own power, widens its horizon, enhances its abilities, clarifies its mind, forges its will.
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 Vladimir Lenin
The art of any propagandist and agitator consists in his ability to find the best means of influencing any given audience, by presenting a definite truth, in such a way as to make it most convincing, most easy to digest, most graphic, and most strongly impressive.
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 Vladimir Lenin
A political leader who desires to be useful to the revolutionary proletariat must be able to distinguish concrete cases of compromises that are inexcusable and are an expression of opportunism and treachery.
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 Vladimir Lenin
The history of all countries shows that the working class exclusively by its own effort is able to develop only trade-union consciousness.
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 Vladimir Lenin