Justin Martyr, also known as Saint Justin (100–165), was an early Christian apologist, and is regarded as the foremost interpreter of the theory of the Logos in the 2nd century. He was martyred and is considered a saint by the Roman Catholic Church and the Eastern Orthodox Church. The First Apology, his most well-known text, passionately defends the morality of the Christian life, and provides various ethical and philosophical arguments to convince the Roman emperor, Antoninus Pius, to abandon the persecution of the fledgling sect.

15. What Christ himself taught Concerning chastity , He uttered such sentiments as these: "Whosoever looks upon a woman to lust after her, has committed adultery with her already in his heart before God." And, "If your right eye offend you, cut it out; for it is better for you to enter into the kingdom of heaven with one eye,...

31. Of the Hebrew prophets There were, then, among the Jews certain men who were prophets of God, through whom the prophetic Spirit published beforehand things that were to come to pass, ere ever they happened. And their prophecies, as they were spoken and when they were uttered, the kings who happened to be reigning among the Jews at the...

46. The Word in the world before Christ But lest some should, without reason, and for the perversion of what we teach, maintain that we say that Christ was born one hundred and fifty years ago under Cyrenius, and subsequently, in the time of Pontius Pilate, taught what we say He taught; and should cry out against us as though...

61. Christian baptism I will also relate the manner in which we dedicated ourselves to God when we had been made new through Christ; lest, if we omit this, we seem to be unfair in the explanation we are making. As many as are persuaded and believe that what we teach and say is true, and undertake to be able...