"World revolution has been so powerfully stimulated and accelerated by the horrors, vileness and abominations of the world imperialist war and by the hopelessness of the situation created by it, this revolution is developing in scope and depth with such splendid rapidity, with such a wonderful variety of changing forms, with such an instructive practical refutation of all doctrinairism, that there is every reason to hope for a rapid and complete recovery of the international communist movement from the infantile disorder of "Left-wing" communism."

“It is not our immediate task to “introduce” socialism, but only to bring social production and the distribution of products at once under the control of the Soviets of Workers’ Deputies.”

“The state is the product and the manifestation of the irreconcilability class antagonisms. The state arises when, where and to the extent that class antagonisms cannot be objectively reconciled. And, conversely, the existence of the state proves that the class antagonisms are irreconcilable.”

“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.”

“One may become a demagogue out of sheer political innocence.”

“The proletariat needs state power, a centralized organisation of force, an organisation of violence, both to crush the resistance of the exploiters and to lead the enormous mass of the population - the peasants, the petty bourgeoisie, and semi-proletarians - in the work of organising a socialist economy.”

“Rectilinearity and one-sidedness, woodenness and petrification, subjectivism and subjective blindness — voilà the epistemological roots of idealism.”