Since the narrator is back to his immature, childish form and its associated level of understanding, Lettie’s explanation eludes him. What she seems to suggest, however, is that to be human is to
not know—instead, it’s to search, to discover, and to play. This also suggests that Lettie would have people behave in a way that the narrator might deem childish, given the way that the narrator described adults as boring and content to form routines, while children are explorers.