[Classics] What Next? Vital Questions for the German Proletariat
"The present pamphlet is a contribution to the theoretical and political work of the Left Opposition. Now, when these differences confront everyone in the form of a great historical problem, it is possible to estimate their origins much better and more profoundly. For the serious revolutionary, for the true Marxist, such a study is absolutely essential. Eclectics live by means of episodic thoughts and improvisations that originate under the impact of events. Marxist cadres capable of leading the proletarian revolution are trained only by the continual and successive working out of problems and disputes." (Trotsky)