“Silly things do cease to be silly if they are done by sensible people in an impudent way.”
Austen’s ironic narration shows how confidence and a favorable opinion of someone can make observers excuse behavior they would otherwise call foolish.
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Emma, Volume II, Chapter VIII, scan-backed 1816 John Murray first edition on Wikisource. After Frank Churchill returns from an impulsive haircut, Emma “moralised to herself” that silly things can cease to seem silly when sensible people do them impudently. This is Emma Woodhouse’s ironic private judgment inside the novel, not Austen endorsing impudence as a general rule.