Ephesians 4:5

The more, therefore, you see the bishop silent, the more do you reverence him. For we ought to receive every one whom the Master of the house sends to be over His household, as we would do Him that sent him. It is manifest, therefore, that we should look upon the bishop even as we would look upon the Lord Himself, standing, as he does, before the Lord. For “it behoves the man who looks carefully about him, and is active in his business, to stand before kings, and not to stand before slothful men.” And indeed Onesimus himself greatly commends your good order in God, that ye all live according to the truth, and that no sect has any dwelling-place among you. Nor indeed do ye hearken to any one rather than to Jesus Christ, the true Shepherd and Teacher. And ye are, as Paul wrote to you, “one body and one spirit, because ye have also been called in one hope of the faith. …

I have confidence of you in the Lord, that ye will be of no other mind. Wherefore I write boldly to your love, which is worthy of God, and exhort you to have but one faith, and one [kind of] preaching, and one Eucharist. For there is one flesh of the Lord Jesus Christ; and His blood which was shed for us is one; one loaf also is broken to all [the communicants], and one cup is distributed among them all: there is but one altar for the whole Church, and one bishop, with the presbytery and deacons, my fellow-servants. …

The Evangelists, too, when they declared that the one Father was “the only true God,” did not omit what concerned our Lord, but wrote: “In the beginning was the Word, and the Word was with God, and the Word was God. The same was in the beginning with God. All things were made by Him, and without Him was not anything made that was made.” And concerning the incarnation: “The Word,” says [the Scripture], “became flesh, and dwelt among us.” And again: “The book of the generation of Jesus Christ, the son of David, the son of Abraham.” And those very apostles, who said “that there is one God,” said also that “there is one Mediator between God and men.” Nor were they ashamed of the incarnation and the passion. For what says [one]? “The man Christ Jesus, who gave Himself” for the life and salvation of the world.

Being mindful of your love and of your zeal in Christ, which ye have manifested towards us, we thought it fitting to write to you, who display such a godly and spiritual love to the brethren, to put you in remembrance of your Christian course, “that ye all speak the same thing, being of one mind, thinking the same thing, and walking by the same rule of faith,” as Paul admonished you. For if there is one God of the universe, the Father of Christ, “of whom are all things;” and one Lord Jesus Christ, our [Lord], “by whom are all things;” and also one Holy Spirit, who wrought in Moses, and in the prophets and apostles; and also one baptism, which is administered that we should have fellowship with the death of the Lord; and also one elect Church; there ought likewise to be but one faith in respect to Christ. …

1. After this fashion also did a presbyter, a disciple of the apostles, reason with respect to the two testaments, proving that both were truly from one and the same God. For [he maintained] that there was no other God besides Him who made and fashioned us, and that the discourse of those men has no foundation who affirm that this world of ours was made either by angels, or by any other power whatsoever, or by another God. For if a man be once moved away from the Creator of all things, and if he grant that this creation to which we belong was formed by any other or through any other [than the one God], he must of necessity fall into much inconsistency, and many contradictions of this sort; to which he will [be able to] furnish no explanations which can be regarded as either probable or true. …

Let us now return to the resurrection, to the defence of which against heretics of all sorts we have given indeed sufficient attention in another work of ours. But we will not be wanting (in some defence of the doctrine) even here, in consideration of such persons as are ignorant of that little treatise. “What,” asks he, “shall they do who are baptized for the dead, if the dead rise not?” Now, never mind that practice, (whatever it may have been.) The Februarian lustrations will perhaps answer him (quite as well), by praying for the dead. Do not then suppose that the apostle here indicates some new god as the author and advocate of this (baptism for the dead. …

And now, as far as I shall be able, I will reply to them who affirm “that the apostles were unbaptized.” For if they had undergone the human baptism of John, and were longing for that of the Lord, then since the Lord Himself had defined baptism to be one ; (saying to Peter, who was desirous of being thoroughly bathed, “He who hath once bathed hath no necessity to wash a second time;” which, of course, He would not have said at all to one not baptized;) even here we have a conspicuous proof against those who, in order to destroy the sacrament of water, deprive the apostles even of John’s baptism. …

I know not whether any further point is mooted to bring baptism into controversy. Permit me to call to mind what I have omitted above, lest I seem to break off the train of impending thoughts in the middle. There is to us one, and but one, baptism; as well according to the Lord’s gospel as according to the apostle’s letters, inasmuch as he says , “One God, and one baptism, and one church in the heavens.” But it must be admitted that the question, “What rules are to be observed with regard to heretics?” is worthy of being treated. For it is to us that that assertion refers. Heretics, however, have no fellowship in our discipline, whom the mere fact of their excommunication testifies to be outsiders. I am not bound to recognize in them a thing which is enjoined on me , because they and we have not the same God, nor one, that is, the same, Christ. …

Why, moreover, should we not rather recognise, from among (the store of) primitive precedents, those which communicate with the later (order of things) in respect of discipline, and transmit to novelty the typical form of antiquity? For look, in the old law I find the pruning-knife applied to the licence of repeated marriage. There is a caution in Leviticus: “My priests shall not pluralize marriages.” I may affirm even that that is plural which is not once for all. That which is not unity is number. In short, after unity begins number. Unity, moreover, is everything which is once for all. …

40 God all things made;” to whom he plainly owns

26. But as far as he is concerned, let us leave him; let us rather deal with that concerning which there is the greatest question. They who contend that persons baptized among the heretics ought to be received as if they had obtained the grace of lawful baptism, say that baptism is one and the same to them and to us, and differs in no respect. But what says the Apostle Paul? “One Lord, one faith, one baptism, one God.” If the baptism of heretics be one and the same with ours, without doubt their faith also is one; but if our faith is one, assuredly also we have one Lord: if there is one Lord, it follows that we say that He is one. …

Cæcilius of Bilta said: I know only one baptism in the Church, and none out of the Church. This one will be here, where there is the true hope and the certain faith. For thus it is written: “One faith, one hope, one baptism;” not among heretics, where there is no hope, and the faith is false, where all things are carried on by lying; where a demoniac exorcises; where one whose mouth and words send forth a cancer puts the sacramental interrogation; the faithless gives faith; the wicked bestows pardon of sins; and Antichrist baptizes in the name of Christ; he who is cursed of God blesses; he who is dead promises life; he who is unpeaceful gives peace; the blasphemer calls upon God; the profane person administers the office of the priesthood; the sacrilegious person establishes an altar. …