Proudhon saw very clearly the end before his eyes, strove to attain it unfalteringly and steadily, and amid all the variety of the developments in which he preached his ideas to the world for a quarter of a century, never betrayed one iota of its contents. The contradiction from which his work suffered lay deeper. It lay in the form of his thought, and partly in the period to which he belonged. Placed on the boundary line between two epochs of social science and of social forms, one of which is marked by dogma and the other by induction, he had not the strength to break completely with one or give himself up completely to the other. His whole life and thought was a constant fight against dogma in every form. He fought against social Utopianism as against religious dogmatism, and fought against the dogmatism of property as against political authority; he sought to transform Socialism upon severely scientific and realistic lines, and to free it from all the fetters of dogmatic religion; and yet, just as Rousseau did, he placed at the head of his system a dogma: "Man is born free"; and at the conclusion of it the teleological phrase of a moral order of society--two propositions which can never be proved by experience, but rather contradict all experience. In the same way this internal contradiction is shown in the principal work of his last period, the _Justice dans le Revolution et dans l'Eglise_, in which Proudhon endeavours to show these two separate worlds in their marked difference one from another without suspecting that he himself fluctuated between both. After he, as a logical idealist, had denied all external force and all authority, and nevertheless as a realist had supported society as the unalterable condition of human life and civilisation, he seeks at the same time to save anarchy and society by a new bond between individuals who have been set free and find this in some internal necessity and internal authority, in a principle which acts upon the will like a force, and determines it in the direction of the general interest independently of all consideration of self-interest. And so the man, who had put away from himself everything of an absolute and _a priori_ nature because he declared a purely empirical foundation of social science to be the source of all immorality, arrived at the assumption of an innate, immanent justice as the first principle of society which he, with the arbitrariness of a catechism writer, declared to be "the first and most essential of our faculties; a sovereign faculty which, by that very fact, is the most difficult to know, the faculty of feeling and affirming our dignity, and consequently of wishing it and defending it as well in the person of others as in our own person."