Of course, the reproving stepmother has only a social gloss of education, while the girl she criticizes has the deeper learning and the more impressive intellect, and a naturalness that allows her to use colloquialisms.
‘… Proverbs and idioms are never used by people of education. “Apple of his eye”! I am really shocked.’
Source: Elizabeth Gaskell, Wives and Daughters (London: Penguin Classics, 1986 (1866)), p. 695