Although approximately half of the Book of Acts deals with Paul's life and works, Acts does not refer to Paul writing letters. Historians believe that the author of Acts did not have access to any of Paul's letters. One piece of evidence suggesting this is that Acts never directly quotes from the Pauline epistles. Discrepancies between the Pauline epistles and Acts would further support the conclusion that the author of Acts did not have access to those epistles when composing Acts.