From the Treasury of Daily Prayer:
St. Luke, the beloved physician referred to by St Paul (Colossians 4:14), presents us with Jesus, whose blood provides the medicine of immortality. As his traveling companion, Paul claimed Luke’s Gospel as his own for its healing of souls (Eusebius). Luke traveled with Paul during the second missionary journey, joining him after Paul received his Macedonian call to bring the Gospel to Europe (Acts 16:10-17). Luke most likely stayed behind in Philippi for seven years, rejoining Paul at the end of the third missionary journey to Macedonia. He traveled with Paul to Troas, Jerusalem, and Caesarea, where Paul was imprisoned for two years (Acts 20:5-21:18). While in Caesarea, Luke may have researched material that he used in his Gospel. Afterward, Luke accompanied Paul on his journey to Rome (Acts 27:1-28:16),. Especially beloved in Luke’s Gospel are the stories of the Good Samaritan (Luke 10:29-37), the prodigal son (Luke 15:11-32), the rich man and Lazarus (Luke 16:19-31), and the Pharisee and the tax collector (Luke 18:9-14). Only Luke provides a detailed account of Christ’s birth (Luke 2:1-20), and the canticles of Mary (Luke 1:46-55), of Zechariah (Luke 1:68-79), and of Simeon (Luke 2:29-32). To show how Christ continued His work in the Early Church through the apostles, Luke also penned the Acts of the Apostles. More than one-third of the New Testament comes form the hand of the evangelist Luke.