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Here are eight reasons why Luke did write the book of Acts.

1.    Luke addressed his Gospel and the book of Acts to the same person, Theophilus, as the book of Luke is addressed to. See Acts 1:1 and Luke 1:1-4. 

2.    Paul calls Luke our good friend the doctor in Colossians 4:14.

3.    The Muratorian Canon attributes the authorship of both the Gospel of Luke and the Book of Acts to Luke the physician. 

4.    Possibly the largest and most convincing piece of evidence is some refer to as the “We Passages.”  The author uses the term “we” to refer to his participation in Paul’s second and third missionary journeys as well as his journey to Rome.  

5.    If Luke did accompany Paul on these various missionary excursions and to Rome he would have been an eyewitness too the events recorded in Acts. 

6.    Luke’s fact checking ability is very solid.  Luke’s ability to correctly write about the Roman officials during the first century is very impressive and without error.  In addition he is extremely exact when it comes to the geographical information and historical information of the cities throughout the coastal Plain, the road from Jerusalem to Caesarea, and the relation between the Temple and the Antonia fortress in Jerusalem.  Dr. Horton suggests that Luke spent two years checking facts in Jerusalem while Paul was in prison Caesarea. 

7.    Luke was also able to accurately describe the social and cultural settings of many of the places thought Palestine during the first century.  He could not have accurately written about places as diverse as Jerusalem and Antioch without actually visiting those places.  In addition to those two he covers other cities like, Philippi, Athens, Ephesus, and Malta.  Unless one visited those cities and spent time there it would be very hard to write with such clarity as Luke does. 

8.    In Luke’s Gospel he focuses on healings more than others and has a more focused approach to explaining the specific diagnosis of the person who was sick.  Also, when he recorded the parable Jesus spoke about how it is easier for a camel to go through the eye of a needle than for a rich man to enter heaven, Luke uses the more classical Greek word for a surgeons needle whereas the other Gospel writers used the more common word for a regular needle.  It would be safe to assume that a doctor would have naturally used the word for a surgeon’s needle because of his familiarity with the medical language.