Gospel originally meant the Christian message ("the gospel"), but in the second century AD the term euangélion (Koine Greek: εὐαγγέλιον, lit. 'good news', from which the English word originated as a calque) came to be used also for the books in which the message was reported. In this sense a gospel can be defined as a loose-knit, episodic narrative of the words and deeds of Jesus, culminating in his trial and death, and concluding with various reports of his post-resurrection appearances.
The Gospels are commonly seen as literature that is based on oral traditions, Christian preaching, and Old Testament exegesis with the consensus being that they are a variation of Greco-Roman biography; similar to other ancient works such as Xenophon's Memoirs of Socrates. They are meant to convince people that Jesus was a charismatic miracle-working holy man, providing examples for readers to emulate. As such, they present the Christian message of the second half of the first century AD, Modern biblical scholars are therefore cautious of relying on the gospels uncritically as historical documents, and although they afford a good idea of Jesus' public career, critical study has largely failed to distinguish his original ideas from those of the later Christian authors, and the focus of research has therefore shifted to Jesus as remembered by his followers, and understanding the Gospels themselves.
