The four canonical gospels share the same basic outline of the life of Jesus: he begins his public ministry in conjunction with that of John the Baptist, calls disciples, teaches and heals and confronts the Pharisees, dies on the cross, and is raised from the dead. The first page of the Gospel of Mark in Armenian, by Sargis Pitsak, 14th century. Important examples include the Gospel of Thomas, the Gospel of Peter, the Gospel of Judas, the Gospel of Mary, infancy gospels such as the Gospel of James (the first to introduce the perpetual virginity of Mary), and gospel harmonies such as the Diatessaron. Many non-canonical gospels were also written, all later than the four canonical gospels, and like them advocating the particular theological views of their various authors. Modern scholars are cautious of relying on the gospels uncritically, but nevertheless, they do provide a good idea of the public career of Jesus, and critical study can attempt to distinguish the original ideas of Jesus from those of the later authors. The contradictions and discrepancies between the first three and John make it impossible to accept both traditions as equally reliable. Mark was the first to be written, using a variety of sources the authors of Matthew and Luke, acting independently, used Mark for their narrative of Jesus's career, supplementing it with the collection of sayings called the Q document and additional material unique to each and there is a near-consensus that John had its origins as a "signs" source (or gospel) that circulated within a Johannine community. All four were anonymous (the modern names were added in the 2nd century), almost certainly none were by eyewitnesses, and all are the end-products of long oral and written transmission. They were probably written between AD 66 and 110.
They contain details which are irreconcilable, and attempts to harmonize them would be disruptive to their distinct theological messages. Each has its own distinctive understanding of Jesus and his divine role: Mark never calls him "God", Luke expands on Mark while eliminating some passages entirely, but still follows his plot more faithfully than does Matthew, and John, the most overtly theological, is the first to make Christological judgements outside the context of the narrative of Jesus's life. The four canonical gospels of Matthew, Mark, Luke and John share the same basic outline: Jesus begins his public ministry in conjunction with that of John the Baptist, calls disciples, teaches and heals and confronts the Pharisees, dies on the cross, and is raised from the dead.
Gospel, meaning "Good News", originally meant the Christian message, but in the 2nd century it came to be used also for the books in which the message was set out in this sense a gospel can be defined as a loose-knit, episodic narrative of the words and deeds of Jesus of Nazareth, culminating in his trial and death and concluding with various reports of his post-resurrection appearances.