In the New Testament, the synoptic Gospels (Mark, Matthew, and Luke) are key sources for research on "the historical Jesus." Scholars disagree on what the historical Jesus was like, but nearly all agree that the proclamation of something called "the kingdom of God" was central to his work, along with the telling of parables and "miraculous" healings. Most scholars would say the key to who Jesus was, and who he thought he was, is to understand what he meant by "the kingdom of God."