Irenaeus, who died 189, remarks: Every Christian "who retains immovable in himself the rule of the truth which he received through Baptism (_ho ton kanona tes altheias akline en eauto katechon, hon dia tou baptismatos eilephe_)" is able to see through the deceit of all heresies. Irenaeus here identifies the baptismal confession with what he calls the "rule of truth, _kanon tes eiltheias_" _i.e._, the truth which is the rule for everything claiming to be Christian. Apparently, this "rule of truth" was the sum of doctrines which every Christian received and confessed at his baptism. The very phrase "rule of truth" implies that it was a concise and definite formulation of the chief Christian truths. For "canon, rule," was the term employed by the ancient Church to designate such brief sentences as were adopted by synods for the practise of the Church. And this "rule of truth" is declared by Irenaeus to be "the old tradition," "the old tradition of the apostles": he te apo ton apostolon en te ekklesia paradosis. (Zahn, _l.c._, 379f.) Irenaeus was the pupil of Polycarp the Martyr; and what he had learned from him, Polycarp had received from the Apostle John. Polycarp, says Irenaeus, "taught the things which he had learned from the apostles, and which the Church has handed down, and which alone are true." According to Irenaeus, then, the "rule of truth" received and confessed by every Christian at his baptism was transmitted by the apostles. The contents of this rule of truth received from the apostles are repeatedly set forth by Irenaeus. In his _Contra Haereses_ (I, 10, 1) one of these summaries reads as follows: "The Church dispersed through the whole world, to the ends of the earth has received from the apostles and their disciples the faith in one God, the Father Almighty, who has made heaven and earth and the sea and all things that are in them, and in one Jesus Christ, the Son of God, who became incarnate for our salvation; and in the Holy Spirit, who has proclaimed through the prophets the dispensations, and the advents, and the birth from a virgin, and the passion, and the resurrection from the dead, and the bodily assumption into heaven of the beloved Christ Jesus our Lord, and His manifestation from heaven in the glory of the Father." It thus appears that the "rule of truth" as Irenaeus knew it, the formulated sum of doctrines mediated by Baptism, which he, in accordance with the testimony of his teacher Polycarp, believed to have been received from the apostles, at least approaches our present Apostolic Creed. 11. Tertullian and Cyprian on Apostles' Creed.