Princeton theologian A. A. Hodge (1823-1886), in his Evangelical Theology writes,
The kingdom of God on earth is not confined to the mere ecclesiastical sphere, but aims at absolute universality, and extends its supreme reign over every department of human life.
It follows that it is the duty of every loyal subject to endeavour to bring all human society, social and political, as well as ecclesiastical, into obedience to its law of righteousness...
It is our duty, as far as lies in our power, immediately to organize human society and all its institutions and organs upon a distinctively Christian basis. Indifference or impartiality here between the law of the kingdom and the law of the world, or of its prince, the devil, is utter treason to the King of Righteousness. The Bible, the great statute-book of the kingdom, explicitly lays down principles which, when candidly applied, will regulate the action of every human being in all relations. There can be no compromise. The King said, with regard to all descriptions of moral agents in all spheres of activity, "He that is not with me is against me." If the national life in general is organized upon non-Christian principles, the churches which are embraced within the universal assimilating power of that nation will not long be able to preserve their integrity.