Although 1 Peter is a short letter, it touches on various doctrines and has much to say about Christian life and duties. It is not surprising that different readers have found it to have different principal themes. For example, it has been characterized as a letter of separation, of suffering and persecution, of suffering and glory, of hope, of pilgrimage, of courage, and as a letter dealing with the true grace of God.
Characteristics that make the letter distinctive are: (1) its unmistakably Jewish nature; (2) its emphasis on vital Christianity, characterized by good deeds and a faith that works (genuine faith must and will be accompanied by a consistent lifestyle); (3) its simple organization; (4) and its familiarity with Jesus' teachings preserved in the Sermon on the Mount.
Leviticus receives its name from the Septuagint (the pre-Christian Greek translation of the Old Testament) and means "concerning the Levites" (the priests of Israel). It serves as a manual of regulations enabling the holy King to set up his earthly throne among the people of his kingdom. It explains how they are to be his holy people and to worship him in a holy manner.
Paul was concerned about the welfare of the churches during this time of persecution under Nero, and he admonishes Timothy to guard the gospel, to persevere in it, to keep on preaching it, and, if necessary, to suffer for it. This is the second "Pastoral Epistle."
Exodus describes the history of the Israelites leaving Egypt after slavery. The book lays a foundational theology in which God reveals his name, his attributes, his redemption, his law and how he is to be worshiped.
Paul's purpose is to refute the Colossian heresy. To accomplish this goal, he exalts Christ as the very image of God, the Creator, the preexistent sustainer of all things, the head of the church, the first to be resurrected, the fullness of deity in bodily form and the reconciler. Thus Christ is completely adequate. We "have been given fullness in Christ." On the other hand, the Colossian heresy was altogether inadequate. It was a hollow and deceptive philosophy, lacking any ability to restrain the old sinful nature.
The theme of Colossians is the complete adequacy of Christ as contrasted with the emptiness of mere human philosophy.
Paul's primary purpose in writing this letter was to thank the Philippians for the gift they had sent him upon learning of his detention at Rome. However, he makes use of this occasion to fulfill several other desires: (1) to report on his own circumstances; (2) to encourage the Philippians to stand firm in the face of persecution and rejoice regardless of circumstances; and (3) to exhort them to humility and unity.
During the first two centuries the gospel was taken from place to place by traveling evangelists and teachers. Believers customarily took these missionaries into their homes and gave them provisions for their journey when they left. Since Gnostic teachers also relied on this practice, 2 John was written to urge discernment in supporting traveling teachers
John's readers were confronted with an early form of Gnostic teaching of the Cerinthian variety. This heresy was also libertine, throwing off all moral restraints. Consequently, John wrote this letter with two basic purposes in mind: (1) to expose false teachers and (2) to give believers assurance of salvation.