National self-sufficiency or "autarchy" is the ideal of [Adolf] Hitler, not of [Karl] Marx and [Vladimir] Lenin.

A means can be justified only by its end. But the end in its turn needs to be justified.

Only when the kulak refused to deliver grain to the State did [Joseph] Stalin, under the pressure of the Left Opposition, accomplish a sharp turn. Being the empiricist that he is, he moved, to the opposite extreme, and set as a task for two or three years the collectivization of all the peasantry, the liquidation of the kulaks as a class, and the compression of the Five Year Plan into four years.

It is therefore not true that the mere existence of the Soviet Union is capable of assuring the victory of the revolution in other countries.

Bureaucracy and social harmony are inversely proportional to each other.

Our differences with [Joseph] Stalin are entirely of a strategical character.

Against my protests a mausoleum was built on the Red Square, a monument unbecoming and offensive to the revolutionary consciousness.