A rare opportunity had at last come for asserting his old convictions. In the struggle between the Prussian Government and the Opposition he saw an opportunity for vindicating a great cause, that of the working men, which would outflank the Liberalism of the middle classes, and might command the sympathy and respect of the Government. But his political programme was entirely subordinate to the social, that of bettering the condition of the working classes; and he believed that as their champion he might have such influence in the Prussian State as to determine it on entering on a great career of social amelioration. The social activity of Lassalle dates from the year 1862. It was a time of new life in Germany. The forces destined to transform the Germany of Hegel into the Germany of Bismarck were preparing. The time for the restoration and unification of the Fatherland under the leadership of Prussia had come. The nation that had so long been foremost in philosophy and theory was to take a leading place in the practical walks of national life, in war and politics, and in the modern methods of industry. The man who died as first German Emperor of the new order ascended the throne of Prussia in 1861. Bismarck, whose mission it was to take the chief part in this great transformation, entered on the scene as Chief Minister of Prussia in the autumn of 1862. The Progressist party, that phase of German Liberalism which was to offer such bitter opposition both to Bismarck and Lassalle, came into existence in 1861. For accomplishing this world-historic change the decisive factor was the Prussian army. The new rulers of Prussia clearly saw that for the success of their plans everything would depend on the efficiency of the army. But on the question of its reorganisation they came into conflict with the Liberals, who, failing to comprehend the policy of Bismarck, refused him the supplies necessary for realising ideals dear to every German patriot. In the controversy so bitterly waged between the Prussian monarchy and the Liberals, Lassalle intervened. As might be expected, he was not a man to be bound by the formulas of Prussian Liberalism, and in a lecture, _On the Nature of a Constitution_, delivered early in 1862, he expounded views entirely at variance with them. In this lecture his aim was to show that a constitution is not a theory or a document written on paper; it is the expression of the strongest political forces of the time. The king, the nobility, the middle class, the working class, all these are forces in the polity of Prussia; but the strongest of all is the king, who possesses in the army a means of political power, which is organised, excellently disciplined, always at hand, and always ready to march. The army is the basis of the actual working constitution of Prussia. In the struggle against a Government resting on such a basis, verbal protests and compromises were of no avail.