The answer is: He wrote in his own handwriting

2 Thessalonians 3:17 - Paul emphasized authenticity in his epistles by signing them with his own hand, distinguishing them from forgeries. This practice underlines the importance of personal touch in communication and the assurance of genuine apostolic authority, reminding readers that letters were integral to early Christian community building and teachings.

Paul's letters, especially his epistles to the Thessalonians, reveal not just his distinct teachings but also his efforts to establish authentic connections within the early Christian community. By writing in his own hand, as stated in 2 Thessalonians 3:17, he offered a reassuring presence, reminding his followers that they were receiving messages from the sincere leader they knew.

Moreover, this personal signature wasn't just a formal authentication; it was emblematic of a deeper relationship he wished to cultivate with the burgeoning church. In the ancient world, letters often passed through many hands, which risked accusations of tampering. By signing them personally, Paul was declaring his commitment to his teachings and his followers’ well-being.

Fun fact: Did you know that in the Greco-Roman context, the practice of signing letters in one’s own hand was quite rare? It was easier to use scribes, who had better handwriting, especially when you were penning something as significant as a theological instruction!

This push for authenticity resonates today, as the importance of personal integrity and genuine relationships in communication remains vitally relevant. Paul’s approach echoes the early community's spirit—a bunch of devoted individuals committed to uniting in love and faith, ensuring all messages of faith and fellowship remained authentic and impactful. Just as they used ink and parchment to spread hope, the methods may differ today, but the essence of sincerity in connection lives on.