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]

And if Constantine had not had the authority over the patronage of the Church, those things which he allotted from the Empire he could not have had the right to allot; and so the Church would be using this gift against right; whereas God wills that offerings should be pure, as is commanded in Leviticus: "No meat offering that ye shall bring unto the Lord shall be made with leaven." And though this command appears to regard those who offer, nevertheless it also regards those who receive an offering. For it is folly to suppose that God wishes to be received that which He forbids to be offered, for in the same book there is a command to the Levites: "Ye shall not make yourselves abominable with any creeping thing that creepeth; neither shall ye make yourselves unclean with them, that ye shall be defiled thereby."[309] But to say that the Church so misuses the patrimony assigned to her is very unseemly; therefore the premiss from which this conclusion followed is false.

XIV.—Again, if the Church had power to bestow authority on the Roman Prince, she would have it either from God, or from herself, or from some Emperor, or from the universal consent of mankind, or at least of the majority of mankind. There is no other crevice by which this power could flow down to the Church. But she has it not from any of these sources; therefore she has it not at all.

It is manifest that she has it from none of these sources; for if she had received it from God, she would have received it either by the divine or by the natural law: because what is received from nature is received from God; though the converse of this is not true. But this power is not received by the natural law; for nature lays down no law, save for the effects of nature, for God cannot fail in power, where he brings anything into being without the aid of secondary agents. Since therefore the Church is not an effect of nature, but of God who said: "Upon this rock I will build my Church," and elsewhere: "I have finished the work which Thou gavest me to do," it is manifest that nature did not give the Church this law.

Nor was this power bestowed by the divine law; for the whole of the divine law is contained in the bosom of the Old or of the New Testament, and I cannot find therein that any thought or care for worldly matters was commanded, either to the early or to the latter priesthood. Nay, I find rather such care taken away from the priests of the Old Testament by the express command of God to Moses,[310] and from the priests of the New Testament by the express command of Christ to His disciples.[311] But it could not be that this care was taken away from them, if the authority of the temporal power flowed from the priesthood; for at least in giving the authority there would be an anxious watchfulness of forethought, and afterwards continued precaution, lest he to whom authority had been given should leave the straight way.

Then it is quite plain that the Church did not receive this power from herself; for nothing can give what it has not. Therefore all that does anything, must be such in its doing, as that which it intends to do, as is stated in the book "of Simple Being."[312] But it is plain that if the Church gave to herself this power, she had it not before she gave it. Thus she would have given what she had not, which is impossible.

But it is sufficiently manifest from what we have previously made evident that the Church has received not this power from any Emperor.

And further, that she had it not from the consent of all, or even of the greater part of mankind, who can doubt? seeing that not only all the inhabitants of Asia and Africa, but even the greater number of Europeans, hold the thought in abhorrence. It is mere weariness to adduce proofs in matters which are so plain.

XV.—Again, that which is contrary to the nature of a thing cannot be counted as one of its essential powers; for the essential powers of each individual follow on its nature, in order to gain its end. But the power to grant authority in that which is the realm of our mortal state is contrary to the nature of the Church.[313] Therefore it is not in the number of its essential powers. For the proof of the minor premiss we must know that the nature of the Church means the form [or essence][314] of the Church. For although men use the word nature not only of the form of a thing, but also of its matter, nevertheless, it is of the form that they use it more properly, as is proved in the book "of Natural Learning."[315] But the [essence or] form of the Church is nothing else than the life of Christ, as it is contained both in His sayings and in His deeds. For His life was the example and ideal of the militant Church, especially of its pastors, and above all of its chief pastor, to whom it belongs to feed the sheep and the lambs of Christ. And therefore when Christ left His life unto men for an example He said in John's Gospel: "I have given you an example that ye should do as I have done to you." And He said unto Peter specially, after that He had committed unto him the office of shepherd, the words which John also reports: "Peter, follow me." But Christ denied before Pilate that His rule was of this sort, saying: "My kingdom is not of this world: if my kingdom were of this world, then would my servants fight, that I should not be delivered to the Jews; but now is my kingdom not from hence."[316]

But this saying must not be understood to mean that Christ, who is God, is not the lord of this kingdom, for the Psalmist says: "The sea is His, and He made it, and His hands formed the dry land."[317] We must understand it to mean that, as the pattern of the Church, He had not the care of this kingdom. It is as if a golden seal were to speak of itself, and say: "I am not the standard for such and such a class of things;" for in so far as it is gold, this saying is untrue, seeing that gold is the standard of all metals; but it is true in so far as it is a sign capable of being received by impression.