We have said that, in 1848, Proudhon recognized three masters. Having no knowledge of the German language, he could not have read the works of Hegel, which at that time had not been translated into French. It was Charles Grun, a German, who had come to France to study the various philosophical and socialistic systems, who gave him the substance of the Hegelian ideas. During the winter of 1844-45, Charles Grun had some long conversations with Proudhon, which determined, very decisively, not the ideas, which belonged exclusively to the bisontin thinker, but the form of the important work on which he labored after 1843, and which was published in 1846 by Guillaumin. Hegel's great idea, which Proudhon appropriated, and which he demonstrates with wonderful ability in the "System of Economical Contradictions," is as follows: Antinomy, that is, the existence of two laws or tendencies which are opposed to each other, is possible, not only with two different things, but with one and the same thing. Considered in their thesis, that is, in the law or tendency which created them, all the economical categories are rational,--competition, monopoly, the balance of trade, and property, as well as the division of labor, machinery, taxation, and credit. But, like communism and population, all these categories are antinomical; all are opposed, not only to each other, but to themselves. All is opposition, and disorder is born of this system of opposition. Hence, the sub-title of the work,--"Philosophy of Misery." No category can be suppressed; the opposition, antinomy, or contre-tendance, which exists in each of them, cannot be suppressed. Where, then, lies the solution of the social problem? Influenced by the Hegelian ideas, Proudhon began to look for it in a superior synthesis, which should reconcile the thesis and antithesis. Afterwards, while at work upon his book on "Justice," he saw that the antinomical terms do not cancel each other, any more than the opposite poles of an electric pile destroy each other; that they are the procreative cause of motion, life, and progress; that the problem is to discover, not their fusion, which would be death, but their equilibrium,--an equilibrium for ever unstable, varying with the development of society.