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If you are writing a paper on Matthew 5:5 ("Blessed are the meek"), Biblia Patristica will show you that Tertullian used this verse to discuss modesty, while Augustine used it to discuss eschatology. Without it, you are reading the Fathers blind.

The Apostolic Fathers (e.g., Clement of Rome, Ignatius of Antioch) The Apologists (e.g., Justin Martyr) Major theologians like Origen, Tertullian, and Cyprian