II John, written by the apostle John in the late 1st century, serves as a warning against false teachings similar to those addressed in I John. This epistle is directed to the church of God, presented in the manner of addressing a Christian woman and her family, focusing on truth in love and Christian hospitality. John highlights the danger posed by false teachers who exploit the kindness of Christians to gain influence within his congregations, cautioning against opening one's home to these destroyers of faith. While the core themes of I John—holding fast to truth, love, and obedience—are present, II John uniquely emphasizes the essence of Christian hospitality, stating that meaningful fellowship arises only from agreement on sound doctrine. John commends the recipients of II John for standing and walking in truth, being stable members of God's church, and remaining faithful to the commandments received from the Father. However, recognizing that standing is just one step from falling, he reminds them to love one another, stressing that this is equivalent to walking according to God's commandments. The epistle underscores a direct link between truth and love, suggesting that those who love the truth naturally exhibit love for others. Beginning in verse 7, John shifts to a warning against associating with or assisting teachers who deny the truth about Jesus Christ and His work, particularly those who reject that Christ came in the flesh. In contrast to I John, which discusses fellowship with God, II John explicitly forbids fellowship with false teachers, reinforcing the necessity of living according to Christ's teachings for a true relationship with the Father and His Son.

The Book of II John, though one of the shortest in the New Testament, carries significant weight in its message. It echoes the broader themes of I John but applies them in a unique context, addressing the issue of traveling teachers and the hospitality extended to them by local churches. The author, presenting himself as the elder, writes to what appears to be a local congregation, referred to symbolically as the chosen lady and her children, discussing the challenges of discerning true from false teachers in broad terms. In II John, the author reminds the readers of the test of true Christianity, emphasizing the importance of doctrine, particularly the acknowledgment of Jesus as the Christ come in the flesh. He warns against receiving false teachers into their homes, as doing so could imply participation in spreading false teachings. The letter highlights the need for steadfastness in the practice and purity of the doctrine of Christ, urging the congregation to continue walking in obedience to God's commandment to love one another. This love, however, must be discerning, not naive or open to deception. The primary purpose of II John is to deliver a warning against associating with or assisting teachers who do not uphold the truth about Jesus Christ. The author commends the recipients for walking in truth and remaining faithful to the commandments, yet he cautions them to remain vigilant, for standing is just one step away from falling. The themes of truth, love, and commandment are woven throughout the letter, encouraging the readers to apply these tests of life consistently in their conduct and to remain strong in their faith.