“Luke the beloved physician and Demas greet you.”
“Luke the beloved physician”
This is the Luke that wrote Luke and Acts. He was Paul’s associate on two missionary expeditions. He joined Paul on the second missionary journey at the city of Troy (Acts 16:10).
Here we learn that Luke is a physician. Luke was not only a physician but a “beloved” physician. Paul loved his personal physician. Luke ministered both with the hand and the heart.
Paul specifically does not name Luke among the Jewish Christians just listed. He was a Gentile convert (cf. II Tim. 4:11; Phile. 24) and probably a Greek. He may have been a student at the University of Tarsus. Luke wrote both the gospel of Luke and the book of Acts.
It is interesting that two of the writers of the gospels are with Paul during this prison confinement. They both have already written their gospels. No doubt Paul would have read them by now.
Faithfulness under duress is true friendship.
Demas had the same advantages as Luke. Both were companions of the apostle. They had the same teaching and example. Two children brought up in the same family can turn to different directions. One will follow Christ, the other will deny him. One will rebel, the other will yield to the teaching of the Word.
We can attribute the fall of Demas to love of the world (II Tim. 4:10). Luke remained true to Paul in his difficulties. This is an issue of character. Would your character stand under pressure?