His gospel and Acts reveals that his temperament was cheerful. At the last, when all were not able or willing to be with Paul, it was Luke that remained true and was at his side. The lesson discovered. Such is exactly what happens with friendship. Paul found this to be true when he was in prison.
Genuine friendship accepts unconditionally.
Paul found this true with the five in Rome. Some suggest that these five took turns keeping Paul company in prison. If this is correct, it reveals the devotion of these five friends to Paul. This title was one of Paul's favorites and stressed the mutual level of Christianity. Regardless of one's training, education, or economic status, all who are in Christ share a mutual work.