During subsequent centuries, we observe the same clear-cut line of demarcation between authentic Christianity and false Christianity. For example, St. Justin the Philosopher (†166), a Christian apologist of the second century, notes in his Dialogue with Trypho the Jew that, “there are such men confessing themselves to be Christians, and confessing the crucified Jesus to be the Lord and Christ, yet not teaching His doctrine, but that of the spirits of error.” St. Justin contrasts these false Christians with the “disciples of the true and pure doctrine of Jesus Christ” (Chapter XXXV). [⁶]