The Gospel of John was beloved by the early church, much as it is today, for its spiritual insight and clear declaration of Jesus' divinity. Clement of Alexandria indeed declared it the "spiritual Gospel." Early disputers with heretics such as Cerinthus and the Ebionites drew upon the Gospel of John to refute their heretical notions and uphold the full deity of Christ. This Gospel more than any other was central to the trinitarian and christological debates of the fourth and fifth centuries.