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. Others have objected that the language of the speeches is too Lukan in style to reflect anyone else's words. Moreover, George Shillington writes that the author of Acts most likely created the speeches accordingly and they bear his literary and theological marks. Conversely, Howard Marshall writes that the speeches were not entirely the inventions of the author and while they may not be accurate word-for-word, the author nevertheless records the general idea of them. Baur (1792–1860), professor of theology at Tübingen in Germany, the first scholar to critique Acts and the Pauline Epistles, and founder of the Tübingen School of theology, argued that Paul, as the "Apostle to the Gentiles", was in violent opposition to the original 12 Apostles. Baur considers the Acts of the Apostles were late and unreliable. This debate has continued ever since, with Adolf Deissmann (1866–1937) and Richard Reitzenstein (1861–1931) emphasising Paul's Greek inheritance and Albert Schweitzer stressing his dependence on Judaism. In the opening verses of , Paul provides a litany of his own apostolic appointment to preach among the Gentiles and his post-conversion convictions about the risen Christ. Paul described himself as set apart for the gospel of God and called to be an apostle and a servant of Jesus Christ. Jesus Christ had revealed Himself to Paul, just as He had appeared to Peter, to James, to the Twelve, after his Resurrection. Paul experienced this as an unforeseen, sudden, startling change, due to all-powerful grace, not as the fruit of his reasoning or thoughts. Paul also describes himself as inflicted with a debilitating physical condition akin to having a handicap which he refers to as "a thorn in the flesh";  There are debates as to whether Paul understood himself as commissioned to take the gospel to the Gentiles at the moment of his conversion. Before his conversion he believed his violent persecution of the church to be an indication of his zeal for his religion; after his conversion he believed Jewish hostility toward the church was sinful opposition, that would incur God's wrath. Paul believed he was halted by Christ, when his fury was at its height.