Marcion is sometimes referred to as one of the gnostics, but from what assessment of his lost writings can be gleaned from his mainstream opponents, his teachings were quite different in nature. His canon included ten Pauline Epistles and one gospel called the Gospel of Marcion, plus a rejection of the whole Hebrew Bible, and did not include the rest of the books later incorporated into the canonical New Testament. He propounded a Christianity free from Jewish doctrines with Paul as the reliable source of authentic doctrine. Paul was, according to Marcion, the only apostle who had rightly understood the new message of salvation as delivered by Christ.