Matthew's main purpose in writing his Gospel (the "good news") is to prove to his Jewish readers that Jesus is their Messiah. He does this primarily by showing how Jesus in his life and ministry fulfilled the Old Testament Scriptures.

Since Mark's Gospel (the "good news") is traditionally associated with Rome, it may have been occasioned by the persecutions of the Roman church in the period c. A.D. 64-67. Mark may be writing to prepare his readers for such suffering by placing before them the life of our Lord.

Luke's Gospel (the "good news") was written to strengthen the faith of all believers and to answer the attacks of unbelievers. It was presented to debunk some disconnected and ill-founded reports about Jesus. Luke wanted to show that the place of the Gentile (non-Jewish) Christian in God's kingdom is based on the teaching of Jesus.

John's Gospel (the "good news") is rather different from the other three, highlighting events not detailed in the others. The author himself states his main purpose clearly in 20:31: "that you may believe that Jesus is the Christ, the Son of God, and that by believing you may have life in his name."

The book of Acts provides a bridge for the writings of the New Testament. As a second volume to Luke's Gospel, it joins what Jesus "began to do and to teach" as told in the Gospels with what he continued to do and teach through the apostles' preaching and the establishment of the church.

Paul's primary theme in Romans is presenting the gospel (the "good news"), God's plan of salvation and righteousness for all humankind, Jew and non-Jew alike.

The first letter to the Corinthians revolves around the theme of problems in Christian conduct in the church. It thus has to do with progressive sanctification, the continuing development of a holy character. Obviously Paul was personally concerned with the Corinthians' problems, revealing a true pastor's (shepherd's) heart.

Because of the occasion that prompted this letter, Paul had a number of purposes in mind: to express the comfort and joy Paul felt because the Corinthians had responded favorably to his painful letter; to let them know about the trouble he went through in the province of Asia; and to explain to them the true nature (its joys, sufferings and rewards) and high calling of Christian ministry.

Galatians stands as an eloquent and vigorous apologetic for the essential New Testament truth that people are justified by faith in Jesus Christ—by nothing less and nothing more—and that they are sanctified not by legalistic works but by the obedience that comes from faith in God's work for them.

Unlike several of the other letters Paul wrote, Ephesians does not address any particular error or heresy. Paul wrote to expand the horizons of his readers, so that they might understand better the dimensions of God's eternal purpose and grace and come to appreciate the high goals God has for the church.

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.

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 (God) in bodily form, and the reconciler.

Although the thrust of the letter is varied, the subject of eschatology (doctrine of last things) seems to be predominant in both Thessalonian letters. Every chapter of 1 Thessalonians ends with a reference to the second coming of Christ.

Since the situation in the Thessalonian church has not changed substantially, Paul's purpose in writing is very much the same as in his first letter to them. He writes (1) to encourage persecuted believers, (2) to correct a misunderstanding concerning the Lord's return, and (3) to exhort the Thessalonians to be steadfast and to work for a living.

During his fourth missionary journey, Paul had instructed Timothy to care for the church at Ephesus while he went on to Macedonia. When he realized that he might not return to Ephesus in the near future, he wrote this first letter to Timothy to develop the charge he had given his young assistant. This is the first of the "Pastoral Epistles."

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."

Apparently Paul introduced Christianity in Crete when he and Titus visited the island, after which he left Titus there to organize the converts. Paul sent the letter with Zenas and Apollos, who were on a journey that took them through Crete, to give Titus personal authorization and guidance in meeting opposition, instructions about faith and conduct, and warnings about false teachers. This is the last of the "Pastoral Epistles."

To win Philemon's willing acceptance of the runaway slave Onesimus, Paul writes very tactfully and in a lighthearted tone, which he creates with wordplay. The appeal is organized in a way prescribed by ancient Greek and Roman teachers: to build rapport, to persuade the mind, and to move the emotions.

The theme of Hebrews is the absolute supremacy and sufficiency of Jesus Christ as revealer and as mediator of God's grace. A striking feature of this presentation of the gospel is the unique manner in which the author employs expositions of eight specific passages of the Old Testament Scriptures.

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.

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.

In his first letter Peter feeds Christ's sheep by instructing them how to deal with persecution from outside the church; in this second letter he teaches them how to deal with false teachers and evildoers who have come into the church.

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.

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.

Itinerant teachers sent out by John were rejected in one of the churches in the province of Asia by a dictatorial leader, Diotrephes, who even excommunicated members who showed hospitality to John's messengers. John wrote this letter to commend Gaius for supporting the teachers and, indirectly, to warn Diotrephes.

Although Jude was very eager to write to his readers about salvation, he felt that he must instead warn them about certain immoral men circulating among them who were perverting the grace of God. Apparently these false teachers were trying to convince believers that being saved by grace gave them license to sin since their sins would no longer be held against them.

John writes to encourage the faithful to resist staunchly the demands of emperor worship. He informs his readers that the final showdown between God and Satan is imminent. Satan will increase his persecution of believers, but they must stand fast, even to death. They are sealed against any spiritual harm and will soon be vindicated when Christ returns, when the wicked are forever destroyed, and when God's people enter an eternity of glory and blessedness.