In the third letter of John, the Apostle John, also known as the Elder, addresses the early Christian community with a focus on the virtues of truth, love, and support for missionaries. Gaius, the recipient of the letter, is lauded for his exemplary spiritual life and his generous hospitality towards traveling missionaries. Demetrius is also mentioned as a man of good reputation, while Diotrephes is called out for his divisive actions and refusal to acknowledge John's authority. The letter underscores the importance of hospitality to those spreading the gospel and the need to confront and resolve conflicts within the church. John's heartfelt plea is for believers to walk in truth and actively participate in the mission of the church by supporting those who carry the message of Jesus Christ to the world.