How are john first letter different from second and third and from each other?

The First Letter of John emphasizes themes of love, fellowship, and assurance of salvation, addressing the community's need for confidence in their faith. In contrast, the Second Letter focuses on the importance of truth and warns against deceivers, promoting adherence to Christ's teachings. The Third Letter is more personal, commending Gaius for his hospitality and urging support for traveling missionaries. Each letter serves distinct purposes while reinforcing the core Christian message of love and truth.