Comrades, the internal causation and lawfulness of historical development was formulated for the first time by Marxist theory. The theory of Marxism, as Marx himself wrote in the introduction to his work Critique of Political Economy, established approximately the following proposition with regard to revolution: No social system departs from the arena until it has developed the productive forces to the maximum degree attainable under the given system; and no new social system appears on the scene unless the economic premises necessary for it have already been prepared by the old social system. This truth, which is basic for revolutionary policy, unquestionably retains all its meaning as a guide for us to this very moment. But more than once has Marxism been understood mechanically, unilaterally and therefore erroneously. Wrong conclusions may likewise be drawn from the foregoing proposition.