Scholars have difficulty defining which ancient Egyptian beliefs are myths. The basic definition of myth suggested by the Egyptologist John Baines is "a sacred or culturally central narrative". In Egypt, the narratives that are central to culture and religion are almost entirely about events among the gods.[17] Actual narratives about the gods' actions are rare in Egyptian texts, particularly from early periods, and most references to such events are mere mentions or allusions. Some Egyptologists, like Baines, argue that narratives complete enough to be called "myths" existed in all periods, but that Egyptian tradition did not favor writing them down. Others, like Jan Assmann, have said that true myths were rare in Egypt and may only have emerged partway through its history, developing out of the fragments of narration that appear in the earliest writings.[18] Recently, however, Vincent Arieh Tobin[19] and Susanne Bickel have suggested that lengthy narration was not needed in Egyptian mythology because of its complex and flexible nature.[20] Tobin argues that narrative is even alien to myth, because narratives tend to form a simple and fixed perspective on the events they describe. If narration is not needed for myth, any statement that conveys an idea about the nature or actions of a god can be called "mythic".[19]