Ambrose of Milan : There are many kinds of baptisms, but one baptism, declares the Apostle. Why? There are baptisms of the Gentiles, but they are not true baptisms. They are washings, but they cannot be baptisms. The body is washed, but the guilt is not washed away; indeed, in that washing it is contracted. However, there were baptisms of the Jews, some excessive, some symbolic. And the symbol itself benefits us, because it is a messenger of truth. — On the Sacraments 2.1.2 Cyprian : 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. But if this unity which cannot be separated and divided at all, is itself also among heretics, why do we contend any more? Why do we call them heretics and not Christians? Moreover, since we and heretics have not one God, nor one Lord, nor one Church, nor one faith, nor even one Spirit, nor one body, it is manifest that neither can baptism be common to us with heretics, since between us there is nothing at all in common. And yet Stephen is not ashamed to afford patronage to such in opposition to the Church, and for the sake of maintaining heretics to divide the brotherhood and in addition, to call Cyprian "a false Christ and a false apostle, and a deceitful worker." And he, conscious that all these characters are in himself, has been in advance of you, by falsely objecting to another those things which he himself ought deservedly to hear. We all bid you, for all our sakes, with all the bishops who are in Africa, and all the clergy, and all the brotherhood, farewell; that, constantly of one mind, and thinking the same thing, we may find you united with us even though afar off. — Epistle LXXIV Cyprian : 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. In addition to all these things, there is also this evil, that the priests of the devil dare to celebrate the Eucharist; or else let those who stand by them say that all these things concerning heretics are false. Behold to what kind of things the Church is compelled to consent, and is constrained without baptism, without pardon of sins, to hold communion. And this thing, brethren, we ought to flee from and avoid, and to separate ourselves from so great a wickedness, and to hold one baptism, which is granted by the Lord to the Church alone. — The Seventh Council of Carthage Under Cyprian Cyprian : Another Julianus of Marcelliana said: If a man can serve two masters, God and mammon, baptism also can serve two masters, the Christian and the heretic. Tenax of Horrea Caeliae said: Baptism is one, but it is the Church's. Where the Church is not there, there can be no baptism. Another Victor of Assuri said: It is written, that "God is one, and Christ is one, and the Church is one, and baptism is one." How, therefore, can any one be baptized there, where God, and Christ, and the one Church is not? Donatulus of Capse said: And I also have always thought this, that heretics, who can obtain nothing without the Church, when they are converted to the Church, must be baptized. Verulus of Rusiccada said: A man who is a heretic cannot give what he has not; much more a schismatic, who has lost what he once had. — The Seventh Council of Carthage Under Cyprian Ignatius of Antioch : Since, also, there is but one unbegotten Being, God, even the Father; and one only-begotten Son, God, the Word and man; and one Comforter, the Spirit of truth; and also one preaching, and one faith, and one baptism; and one Church which the holy apostles established from one end of the earth to the other by the blood of Christ, and by their own sweat and toil; it behoves you also, therefore, as "a peculiar people, and a holy nation," to perform all things with harmony in Christ. — Epistle of Ignatius to the Philadelphians Ignatius of Antioch : 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. — Epistle of Pseudo-Ignatius to the Antiochians Jerome : There is one Lord and one God, because the dominion of Father and Son is a single Godhead. The faith is said to be one because we believe similarly in Father, Son and Holy Spirit. Baptism is one. We are all baptized in the same way in the name of the Father, Son and Holy Spirit. We are immersed three times so that the sacrament of the Trinity may be apparent.… There is one baptism in the Spirit, in water and in fire. — Commentary on Ephesians 4:5-6 John Chrysostom : Ye then who in the spiritual world have so great equality of privileges, whence is it that ye are high-minded? Is it that one is wealthy and another strong? How ridiculous must this be? For tell me, if the emperor some day were to take ten persons, and to array them all in purple, and seat them on the royal throne, and to bestow upon all the same honor, would any one of these, think ye, venture to reproach another, as being more wealthy or more illustrious than he? Surely never. And I have not yet said all; for the difference is not so great in heaven as here below we differ. There is "one Lord, one faith, one baptism." Behold "the hope of your calling. One God and Father of all, who is over all, and through all, and in all." For can it be, that thou art called by the name of a greater God, another, of a lesser God? That thou art saved by faith, and another by works? That thou hast received remission in baptism, whilst another has not? "There is one God and Father of all, who is over all, and through all, and in all." "Who is over all," that is, the Lord and above all; and "through all," that is, providing for, ordering all; and "in you all," that is, who dwelleth in you all. Now this they own to be an attribute of the Son; so that were it an argument of inferiority, it never would have been said of the Father. — Homily on Ephesians 11 Tertullian : His only aim in alluding to it was) that he might all the more firmly insist upon the resurrection of the body, in proportion as they who were vainly baptized for the dead resorted to the practice from their belief of such a resurrection. We have the apostle in another passage defining "but one baptism." To be "baptized for the dead" therefore means, in fact, to be baptized for the body; for, as we have shown, it is the body which becomes dead. — Against Marcion Book V Tertullian : To be "baptized for the dead" therefore means, in fact, to be baptized for the body; for, as we have shown, it is the body which becomes dead. What, then, shall they do who are baptized for the body, if the body rises not again? We stand, then, on firm ground (when we say) that the next question which the apostle has discussed equally relates to the body. — Against Marcion Book V Tertullian : Happy is our sacrament Of water, in that, by washing away the sins of our early blindness, we are set free and admitted into eternal life! A treatise on this matter will not be superfluous; instructing not only such as are just becoming formed (in the faith), but them who, content with having simply believed, without full examination of the grounds of the traditions, carry (in mind), through ignorance, an untried though probable faith. — On Baptism Tertullian : But the Jewish Israel bathes daily, because he is daily being defiled: and, for fear that defilement should be practised among us also, therefore was the definition touching the one bathing made. — On Baptism Tertullian : God wills us all to he so conditioned, as to be ready at all times and places to undertake (the duties of) His sacraments. There is "one God, one faith," one discipline too. — On Exhortation to Chastity