James D. G. Dunn's 2003 study, "Jesus Remembered", was the onset for this "increased ... interest in memory theory and eyewitness testimony". Dunn argues that "he only realistic objective for any 'quest of the historical Jesus' is Jesus "remembered"." Dunn argues that Christianity started with the impact Jesus himself had on his followers, who passed on and shaped their memories of him in an oral gospel tradition. According to Dunn, to understand who Jesus was, and what his impact was, scholars have to look at "the broad picture, focusing on the characteristic motifs and emphases of the Jesus tradition, rather than making findings overly dependent on individual items of the tradition".