Who has really altered the Gospel
After this he says that some believers, like people come from a drinking bout to the point of turning on themselves, alter the Gospel from its first writing three and four and many times over, and reshape it, so that they may have a way of denying when they are refuted.
But I know of no others who have altered the Gospel except the followers of Marcion and of Valentinus, and I think also those of Lucan. Yet this charge, when made, is a charge not against the teaching but against those who have dared to tamper with the Gospels. Just as the sophists, the Epicureans, the Peripatetics, or whoever else may hold false opinions are no ground for a charge against philosophy, so those who alter the Gospels and bring in sects foreign to the intent of Jesus’ teaching are no ground for a charge against true Christianity.
Greek
Μετὰ ταῦτά τινας τῶν πιστευόντων φησὶν ὡς ἐκ μέθης ἥκοντας εἰς τὸ ἐφεστάναι αὑτοῖς μεταχαράττειν ἐκ τῆς πρώτης γραφῆς τὸ εὐαγγέλιον τριχῇ καὶ τετραχῇ καὶ πολλαχῇ καὶ μεταπλάττειν, ἵν᾿ ἔχοιεν πρὸς τοὺς ἐλέγχους ἀρνεῖσθαι. μεταχαράξαντας δὲ τὸ εὐαγγέλιον ἄλλους οὐκ οἶδα ἢ τοὺς ἀπὸ Μαρκίωνος καὶ τοὺς ἀπὸ Οὐαλεντίνου οἶμαι δὲ καὶ τοὺς ἀπὸ Λουκάνου. τοῦτο δὲ λεγόμενον οὐ τοῦ λόγου ἐστὶν ἔγκλημα ἀλλὰ τῶν τολμησάντων ῥᾳδιουργῆσαι τὰ εὐαγγέλια. καὶ ὥσπερ οὐ φιλοσοφίας ἔγκλημά εἰσιν οἱ σοφισταὶ ἢ οἱ Ἐπικούρειοι ἢ οἱ Περιπατητικοὶ ἢ οἵτινές ποτ᾿ ἂν ὦσιν οἱ ψευδοδοξοῦντες, οὕτως οὐ τοῦ ἀληθινοῦ χριστιανισμοῦ ἔγκλημα οἱ μεταχαράττοντες τὰ εὐαγγέλια καὶ αἱρέσεις ξένας ἐπεισάγοντες τῷ βουλήματι τῆς Ἰησοῦ διδασκαλίας.