First Apology of Justin Martyr

The purpose of the Apology is to prove to the emperors, renowned as upright and philosophical men, the injustice of the persecution of the Christians, who are the representatives of true philosophy … Christians are the true worshipers of God, the Creator of all things; they offer him the only sacrifices worthy of him, those of prayer and thanksgiving, and are taught by his Son, to whom they assign a place next in honor to him. This teaching leads them to perfect morality, as shown in their teacher's words and their own lives, and founded on their belief in the resurrection. (Summary from Wikipedia)