The truth is to be found nowhere else but in the Catholic Church, the sole depository of apostolical doctrine. Heresies are of recent formation, and cannot trace their origin up to the apostles

1. Since therefore we have such proofs, it is not necessary to seek the truth among others which it is easy to obtain from the Church; since the apostles, like a rich man [depositing his money] in a bank, lodged in her hands most copiously all things pertaining to the truth: so that every man, whosoever will, can draw from her the water of life.³³¹⁸ For she is the entrance to life; all others are thieves and robbers. On this account are we bound to avoid them, but to make choice of the thing pertaining to the Church with the utmost diligence, and to lay hold of the tradition of the truth. For how stands the case? Suppose there arise a dispute relative to some important question³³¹⁹ among us, should we not have recourse to the most ancient Churches with which the apostles held constant intercourse, and learn from them what is certain and clear in regard to the present question? For how should it be if the apostles themselves had not left us writings? Would it not be necessary, [in that case,] to follow the course of the tradition which they handed down to those to whom they did commit the Churches?

2. To which course many nations of those barbarians who believe in Christ do assent, having salvation written in their hearts by the Spirit, without paper or ink, and, carefully preserving the ancient tradition,³³²⁰ believing in one God, the Creator of heaven and earth, and all things therein, by means of Christ Jesus, the Son of God; who, because of His surpassing love towards His creation, condescended to be born of the virgin, He Himself uniting man through Himself to God, and having suffered under Pontius Pilate, and rising again, and having been received up in splendour, shall come in glory, the Saviour of those who are saved, and the Judge of those who are judged, and sending into eternal fire those who transform the truth, and despise His Father and His advent. Those who, in the absence of written documents,³³²¹ have believed this faith, are barbarians, so far as regards our language; but as regards doctrine, manner, and tenor of life, they are, because of faith, very wise indeed; and they do please God, ordering their conversation in all righteousness, chastity, and wisdom. If any one were to preach to these men the inventions of the heretics, speaking to them in their own language, they would at once stop their ears, and flee as far off as possible, not enduring even to listen to the blasphemous address. Thus, by means of that ancient tradition of the apostles, they do not suffer their mind to conceive anything of the [doctrines suggested by the] portentous language of these teachers, among whom neither Church nor doctrine has ever been established.

3. For, prior to Valentinus, those who follow Valentinus had no existence; nor did those from Marcion exist before Marcion; nor, in short, had any of those malignant-minded people, whom I have above enumerated, any being previous to the initiators and inventors of their perversity. For Valentinus came to Rome in the time of Hyginus, flourished under Pius, and remained until Anicetus. Cerdon, too, Marcion's predecessor, himself arrived in the time of Hyginus, who was the ninth bishop.³³²² Coming frequently into the Church, and making public confession, he thus remained, one time teaching in secret, and then again making public confession; but at last, having been denounced for corrupt teaching, he was excommunicated³³²³ from the assembly of the brethren. Marcion, then, succeeding him, flourished under Anicetus, who held the tenth place of the episcopate. But the rest, who are called Gnostics, take rise from Menander, Simon's disciple, as I have shown; and each one of them appeared to be both the father and the high priest of that doctrine into which he has been initiated. But all these (the Marcosians) broke out into their apostasy much later, even during the intermediate period of the Church.

Chapter V.—Christ and His apostles, without any fraud, deception, or hypocrisy, preached that one God, the Father, was the founder of all things. They did not accommodate their doctrine to the prepossessions of their hearers.

1. Since, therefore, the tradition from the apostles does thus exist in the Church, and is permanent among us, let us revert to the Scriptural proof furnished by those apostles who did also write the Gospel, in which they recorded the doctrine regarding God, pointing out that our Lord Jesus Christ is the truth,³³²⁴ and that no lie is in Him. As also David says, prophesying His birth from a virgin, and the resurrection from the dead, "Truth has sprung out of the earth."³³²⁵ The apostles, likewise, being disciples of the truth, are above all falsehood; for a lie has no fellowship with the truth, just as darkness has none with light, but the presence of the one shuts out that of the other. Our Lord, therefore, being the truth, did not speak lies; and whom He knew to have taken origin from a defect, He never would have acknowledged as God, even the God of all, the Supreme King, too, and His own Father, an imperfect being as a perfect one, an animal one as a spiritual, Him who was without the Pleroma as Him who was within it. Neither did His disciples make mention of any other God, or term any other Lord, except Him, who was truly the God and Lord of all, as these most vain sophists affirm that the apostles did with hypocrisy frame their doctrine according to the capacity of their hearers, and gave answers after the opinions of their questioners,—fabling blind things for the blind, according to their blindness; for the dull according to their dulness; for those in error according to their error. And to those who imagined that the Demiurge alone was God, they preached him; but to those who are capable of comprehending the unnameable Father, they did declare the unspeakable mystery through parables and enigmas: so that the Lord and the apostles exercised the office of teacher not to further the cause of truth, but even in hypocrisy, and as each individual was able to receive it!

2. Such [a line of conduct] belongs not to those who heal, or who give life: it is rather that of those bringing on diseases, and increasing ignorance; and much more true than these men shall the law be found, which pronounces every one accursed who sends the blind man astray in the way. For the apostles, who were commissioned to find out the wanderers, and to be for sight to those who saw not, and medicine to the weak, certainly did not address them in accordance with their opinion at the time, but according to revealed truth. For no persons of any kind would act properly, if they should advise blind men, just about to fall over a precipice, to continue their most dangerous path, as if it were the right one, and as if they might go on in safety. Or what medical man, anxious to heal a sick person, would prescribe in accordance with the patient's whims, and not according to the requisite medicine? But that the Lord came as the physician of the sick, He does Himself declare saying, "They that are whole need not a physician, but they that are sick; I came not to call the righteous, but sinners to repentance."³³²⁶ How then shall the sick be strengthened, or how shall sinners come to repentance? Is it by persevering in the very same courses? or, on the contrary, is it by undergoing a great change and reversal of their former mode of living, by which they have brought upon themselves no slight amount of sickness, and many sins? But ignorance, the mother of all these, is driven out by knowledge. Wherefore the Lord used to impart knowledge to His disciples, by which also it was His practice to heal those who were suffering, and to keep back sinners from sin. He therefore did not address them in accordance with their pristine notions, nor did He reply to them in harmony with the opinion of His questioners, but according to the doctrine leading to salvation, without hypocrisy or respect of person.

3. This is also made clear from the words of the Lord, who did truly reveal the Son of God to those of the circumcision—Him who had been foretold as Christ by the prophets; that is, He set Himself forth, who had restored liberty to men, and bestowed on them the inheritance of incorruption. And again, the apostles taught the Gentiles that they should leave vain stocks and stones, which they imagined to be gods, and worship the true God, who had created and made all the human family, and, by means of His creation, did nourish, increase, strengthen, and preserve them in being; and that they might look for His Son Jesus Christ, who redeemed us from apostasy with His own blood, so that we should also be a sanctified people,—who shall also descend from heaven in His Father's power, and pass judgment upon all, and who shall freely give the good things of God to those who shall have kept His commandments. He, appearing in these last times, the chief cornerstone, has gathered into one, and united those that were far off and those that were near;³³²⁷ that is, the circumcision and the uncircumcision, enlarging Japhet, and placing him in the dwelling of Shem.³³²⁸