(of faith)," the Christian must remain true to the faith, for "no one is a Christian but he who perseveres even to the end" (Prescription Against Heretics 3). Christian apologist Justin Martyr engages in a dialogue with Trypho (c. 160), who says, "I believe, however, that many of those who say that they confess Jesus, and are called Christians, eat meats offered to idols, and declare that they are by no means injured in consequence" (Dialogue with Trypho 35). Justin's response highlights the importance of remaining faithful to "the true and pure doctrine of Jesus Christ" in the face of false teachers: The fact that there are such men confessing themselves to be Christians, and admitting the crucified Jesus to be both Lord and Christ, yet not teaching His doctrines, but those of the spirits of error, causes us who are disciples of the true and pure doctrine of Jesus Christ, to be more faithful and steadfast in the hope announced by Him. For what things He predicted would take place in His name, these we do see being actually accomplished in our sight. For he said, "Many shall come in My name, clothed outwardly in sheep's clothing, but inwardly they are ravening wolves." And, "There shall be schisms and heresies." [1 Corinthians 11:19] And, "Beware of false prophets, who shall come to you clothed outwardly in sheep's clothing, but inwardly they are ravening wolves." And, "Many false Christ's and false apostles shall arise, and shall deceive many of the faithful." There are, therefore, and there were many, my friends, who, coming forward in the name of Jesus, taught both to speak and act impious and blasphemous things; and these are called by us after the name of the men from whom each doctrine and opinion had its origin. (For some in one way, others in another, teach to blaspheme the Maker of all things, and Christ . . . Yet they style themselves Christians. . . .) Some are called Marcians, and some Valentinians, and some Basilidians, and some Saturnilians, and others by other names; each called after the originator of the individual opinion. . . . So that, in consequence of these events, we know that Jesus foreknew what would happen after Him, as well as in consequence of many other events which He foretold would befall those who believed on and confessed Him, the Christ. For all