It is the history of the great evangelization of the world carried out by Saint Peter and Saint Paul, as they made their way from Jerusalem to Rome. There Caesar Nero eventually martyred them both. As they progressed on their great missionary journeys these two disciples, and many others besides, wrote letters to the Christian communities that they founded, visited, and left behind. These letters became in our Bible the Epistles. They give to us, as they gave to the Christian community for whom they were originally meant, the great rules, regulations, and advice on living our faith in Jesus Christ.
Love is kind.
Love does not put on airs. It does not brood over others' injuries, but rejoices in the Truth. Finally, the last book of the Bible is itself a separate section. It is called the Book of Revelation, or the Apocalypse. Apocalyptic literature was very popular at the time of Jesus.