Marxism is first and foremost a critical method, since it is the product of a class which can only emancipate itself through the ruthless criticism of all existing conditions. A revolutionary organisation that fails to criticise its errors, to learn from its mistakes, inevitably exposes itself to the conservative and reactionary influences of the dominant ideology. And this is all the more true at a time of revolution, which by its very nature has to break new ground, enter an unknown landscape with little more than a compass of general principles to find its way. As we shall see, one of the consequences of the Bolshevik party identifying itself with the Soviet state was that it increasingly lost this capacity to criticise itself and the general course of the revolution. But as long as it remained a proletarian party it continuously generated minorities who did continue to carry out this task.