"The theory of "defeating" opportunist elements by the ideological struggle within the Party, the theory of "overcoming" these elements within the confines of a single party, is a rotten and dangerous theory, which threatens to condemn the Party to paralysis and chronic infirmity, threatens to leave the Party a prey to opportunism, threatens to leave the proletariat without a revolutionary party, threatens to deprive the proletariat of its main weapon in the fight against imperialism. Our Party could not have emerged on to the broad highway, it could not have seized power and organised the dictatorship of the proletariat, it could not have emerged victorious from the civil war, if it had had within its ranks people like Martov and Dan, Potresov and Axelrod. Our Party succeeded in achieving internal unity and unexampled cohesion of its ranks primarily because it was able to in good time to purge itself of the opportunist pollution, because it was able to rid its ranks of the Liquidators and Mensheviks. Proletarian parties develop and become strong by purging themselves of opportunists and reformists, social-imperialists and social-chauvinists, social-patriots and social-pacifists."

“If, against all expectation, Germany finds itself in a difficult situation then she can be sure that the Soviet people will come to Germany's aid and will not allow Germany to be strangled. The Soviet Union wants to see a strong Germany and we will not allow Germany to be thrown to the ground.”

“I know that the gentlemen in the enemy camp may think of me however they like. I consider it beneath me to try to change the minds of these gentlemen.”

“Tsar Alexander reached Paris.”

“The mortal sin of the Second International was not that it pursued at that time the tactics of utilising parliamentary forms of struggle, but that it overestimated the importance of these forms, that it considered them virtually the only forms; and that when the period of open revolutionary battles set in and the question of extra-parliamentary forms of struggle came to the fore, the parties of the Second International turned their backs on these new tasks, refused to shoulder them.”

“The Party is the highest form of organisation of the proletariat. The Party is the principle guiding force within the class of the proletarians and among the organisations of that class. But it does not by any means follow from this that the Party can be regarded as an end in itself, as a self-sufficient force. The Party is not only the highest form of class association of the proletarians; it is at the same time an instrument in the hands of the proletariatfor achieving the dictatorship, when that has not yet been achieved and for consolidating and expanding the dictatorship when it has already been achieved. The Party could not have risen so high in importance and could not have exerted its influence over all other forms of organisations of the proletariat, if the latter had not been confronted with the question of power, if the conditions of imperialism, the inevitability of wars, and the existence of a crisis had not yet demanded the concentration of all the forces of the proletariat at one point, the gathering of all the threads of the revolutionary movement in one spot in order to overthrow the bourgeoisie and to achieve the dictatorship of the proletariat. The proletariat needs the Party first of all as its General Staff, which it must have for the successful seizure of power. It scarcely needs proof that without a party capable of rallying around itself the mass organisations of the proletariat, and of centralising the leadership of the entire movement during the progress of the struggle , the proletariat in Russia could not have established its revolutionary dictatorship.”

“We disagreed with Zinoviev and Kamenev because we knew that the policy of amputation was fraught with great dangers for the Party, that the method of amputation, the method of blood-letting — and they demanded blood — was dangerous, infectious: today you amputate one limb, tomorrow another, the day after tomorrow a third — what will we have left in the Party?”