The argument used by our Lord is very plain. The son of a king is exempt from tribute. "I am the Son of the King of kings, and, therefore, owe no tribute to the servants of My Father." But, if our Lord owed no tribute to any temporal ruler, He owed no kind of obedience or subjection. And as He paid tribute as a free act of condescension, in order to uphold the authority of kings, so, for the same reason, He respected that authority in other things. {128} His emblematic action in providing, miraculously, a coin for the tribute-money, which He ordered St. Peter to pay in the name of Christ and for himself also, insinuates in the most significant manner that St. Peter was to obtain from Him a like privilege with that which He possessed by natural right as the Son of God. Christ is a sovereign in His own native right. The Vicar of Christ is a sovereign by a delegated privilege. The obedience of Christ to temporal rulers and laws was not due by the obligation of a subject, but a mere voluntary conformity for the sake of the common good. So, also, the Vicars of Christ, independent of all temporal rulers and laws, should be bound to God alone, and not before men, to subject themselves to the authority of an earthly sovereign, only so far as times and circumstances might require them to do so for the well-being of the Church. For several centuries it was, in fact, necessary for the Popes to submit to the sovereignty of the Roman emperors, pagan and Christian. During this period they maintained their spiritual independence and supremacy chiefly by an incessant conflict with the imperial power--frequently ended only by their martyrdom. It was partially secured by the voluntary respect and obedience of the Christian emperors to the spiritual authority of the Vicar of Christ. But this was an imperfect state, suited only to the beginnings of the Church; and therefore the providence of God gave to the Popes the temporal sovereignty over Rome. {129} The personal sovereignty and independence of the Pope was given him by a divine right, and conferred on him immediately by Jesus Christ. This divine right did not, however, convey an immediate title to the possession of any temporal kingdom of subjects. It only gave the right to acquire such a kingdom by human right, and made this human right, once acquired, sacred and inviolable. The title of the Popes to the sovereignty of Rome is, therefore, in its origin human, and based on principles of human law and justice; but in regard to its inalienable, inviolable sacredness, it is of divine right. It is not essentially contained in that sovereignty which Christ gave to St. Peter and his successors, but it is its natural and necessary consequence. It is annexed to it for its maintenance and protection. Ever since the civilized nations became Christian, this sovereignty has been necessary, and it still continues, and must remain in future, necessary for the due exercise of the spiritual supremacy of the Roman Church