Saint Luke was an early Christian leader who is said by tradition to be the author of both the Gospel of Luke and the Acts of the Apostles, the third and the fifth books, respectively, of the New Testament. The composition of the writings, as well as the range of vocabulary used, indicate that the author was an educated man. The quote in the Letter of Paul to the Colossians differentiating between Luke and other colleagues "of the circumcision" has caused many to speculate that this indicates Luke was a Gentile. If this were true, it would make Luke the only writer of the New Testament who can clearly be identified as not being Jewish. However, that is not the only possibility. The phrase could just as easily be used to differentiate between those Christians who strictly observed the rituals of Judaism and those who didn't. He is Patron Saint of Artists, Physicians, Surgeons, and others