The girls all have very different interests – no apparent common ground at all. Nonetheless, Miss Brodie’s charisma alone draws them together and preserves their group identity. We later learn that what the girls are famous for doesn’t necessarily reflect who they really are. For example, though Rose is famous for sex, she never talks about sex, much less indulges in it. Even though Sandy has small eyes, she has very perceptive “vision”: she is psychologically insightful, deeply analytical. The quote here, "Where there is no vision...the people perish," is actually a quote from the Bible's book of Proverbs. Though Miss Brodie's use of the quote appears to apply to Tennyson's poetic vision, it also suggests that she thinks her vision is the one that rightly sustains her girls.