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A long introduction covers the genre, the circumstances and the aim of John's epistles (the 2nd and the 3rd more resembling notes), the relation between St. John's Gospel and First Epistle, the style (both polemic and didactic), the sources, the structure, the theological aim (Michèle Morgan comments the three epistles verse by verse). The author of the First Epistle "founds the commandment of mutual love on the divine movement of love manifest in the Son's advent. Because of Jesus Christ, by and since Jesus Christ, communion with God is confirmed in our communion with each other it is that justice (and commandment) that those who call themselves children of God are called upon to practice."