‏ Titus 2:15

15. with all authority--Translate, "authoritativeness" (compare "sharply," Tit 1:13).

Let no man despise thee--Speak with such vigor as to command respect (1Ti 4:12). Warn them with such authority that no one may think himself above (so the Greek literally) the need of admonition [Tittmann, Greek Synonyms of the New Testament].
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