We prove that the authority of the Church is not the cause of the authority of the Empire in the following manner. Nothing can be the cause of power in another thing when that other thing has all its power, while the first either does not exist, or else has no power of action.[307] But the Empire had its power while the Church was either not existing at all, or else had no power of acting. Therefore the Church is not the cause of the power of the Empire, and therefore not of its authority either, for power and authority mean the same thing. Let A be the Church, B the Empire, C the authority or power of the Empire. If C is in B while A does not exist, A cannot be the cause of C being in B, for it is impossible for an effect to exist before its cause. Further, if C is in B while A does not act, it cannot be that A is the cause of C being in B; for, to produce an effect, it is necessary that the cause, especially the efficient cause of which we are speaking, should have been at work first. The major premiss of this argument is self-evident, and the minor premiss is confirmed by Christ and the Church. Christ confirms it by His birth and His death, as we have said; the Church confirms it in the words which Paul spake to Festus in the Acts of the Apostles: "I stand at Cæsar's judgment-seat, where I ought to be judged," and by the words which an angel of God spake to Paul a little afterwards: "Fear not, Paul; thou must be brought before Cæsar;" and again by Paul's words to the Jews of Italy: "But when the Jews spake against it, I was constrained to appeal unto Cæsar; not that I had aught to accuse my nation of," but "to deliver my soul from death." But if Cæsar had not at that time had the authority to judge in temporal matters, Christ would not have argued thus; nor would the angel have brought these words; nor would he, who spake of himself as "having a desire to depart and to be with Christ," have made an appeal to a judge not having authority.[308] [Footnote 307: "_Non virtuante._"] [Footnote 308: "_Incompetentem._" Acts xxv. 10; xxvii. 24; xxviii. 19. Phil. i. 23.--(W.)]