Saint Luke, also called Saint Luke the Evangelist, (flourished in 1st century; feast day October 18), in Christian tradition, the author of the Gospel According to Luke and the Acts of the Apostles, a companion of St. Paul the Apostle, and the most literary of the New Testament writers. Information about his life is scanty. Tradition based on references in the Pauline Letters has regarded him as a physician and a Gentile. He probably accompanied Paul on several missionary journeys.
Luke is first mentioned in the letters of Paul as the latter’s “coworker” and as the “beloved physician.” The former designation is the more significant one, for it identifies him as one of a professional cadre of itinerant Christian “workers,” many of whom were teachers and preachers. His medical skills, like Paul’s tentmaking, may have contributed to his livelihood; but his principal occupation was the advancement of the Christian mission.
If Luke was the author of the third Gospel and the Acts of the Apostles, the course and nature of his ministry may be sketched in more detail from both texts. He excludes himself from those who were eyewitnesses of Christ’s ministry. He indicates participation in the Pauline mission by the use of the first person in the “we” sections of Acts. They suggest that Luke shared in instructing persons in the Christian message and possibly in performing miraculous healings.