Only the defeat of the proletariat in Germany in 1923 gave the decisive push to the creation of Stalin's theory of national socialism: the downward curve of the revolution gave rise to Stalinism, not to the theory of the permanent revolution, which was first formulated by me in 1905. This theory is not bound to a definite calendar of revolutionary events; it only reveals the world-wide interdependence of the revolutionary process.
Leon TrotskyThe revolution has its own laws: in the period of its culmination it pushes the most highly developed, determined and far-seeing stratum of the revolutionary class to the most advanced positions.
Leon TrotskyIn Stalin each [Soviet bureaucrat] easily finds himself. But Stalin also finds in each one a small part of his own spirit. Stalin is the personification of the bureaucracy. That is the substance of his political personality.
Leon TrotskyThe fall of the present bureaucratic dictatorship [in the Soviet Union], if it were not replaced by a new socialist power, would thus mean a return to capitalist relations with a catastrophic decline of industry and culture.
Leon Trotsky