This witness is true. Wherefore rebuke them sharply, that they may be sound in the faith; This witness is true - What Epimenides said of them nearly 600 years before continued still to be true. Their original character had undergone no moral change.
Rebuke them sharply - Αποτομως· Cuttingly, severely; show no indulgence to persons guilty of such crimes.
That they may be sound in the faith - That they may receive the incorrupt doctrine, and illustrate it by a holy and useful life.