Its purpose was, first, to establish the proposition that the empire, or supreme universal temporal monarchy, was necessary for the good order of the world; secondly, that the Roman people had rightfully attained the dignity of this empire; and thirdly, that the authority thus obtained was derived immediately from God, and was not dependent on any earthly agent or vicar of God. The discussion of the first proposition is the most interesting part of the treatise, for it involves the statement of Dante's general conception of the end of government and of the true political order. His argument begins with the striking assertion that the proper work of the human race, taken as a whole, is to bring into activity all the possibilities of the intelligence, first to the end of speculation, and secondly in the application of speculation to action. He goes on to declare that this can be achieved only in a state of peace; that peace is only to be secured under the rule of one supreme monarch; that thus the government of the earth is brought into correspondence with the Divine government of the universe; and that only under a universal supreme monarchy can justice be fully established and complete liberty enjoyed. The arguments to maintain these theses are ingenious, and in some instances forcible; but are too abstract, and too disregardful of the actual conditions of society. Dante's loftiness of view, his fine ideal of the possibilities of human life, and his ardent desire to improve its actual conditions, are manifest throughout, and give value to the little book as a treatise of morals beyond that which it possesses as a manual of practical politics. There is little in the 'De Monarchia' which reflects the heat of the great secular debate between Guelf and Ghibelline; but something of the passion engendered by it finds expression in the opening of the third book, where Dante, after citing the words of the prophet Daniel, "He hath shut the lions' mouths and they have not hurt me, forasmuch as before him justice was found in me," goes on in substance as follows:--