British Jewish scholar Hyam Maccoby contended that Paul — as described in the book of Acts — is quite different from the view of Paul gleaned from his own writings. Some difficulties have been noted in the account of his life. Paul as described in the Book of Acts is much more interested in factual history, less in theology; ideas such as justification by faith are absent as are references to the Spirit, according to Maccoby. He also pointed out that there are no references to John the Baptist in the Pauline Epistles, although Paul mentions him several times in the Book of Acts.