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What does Creon mean when he says, "In the practice of authority and rule, for my part, I have always held the view, and hold it still, that a king whose lips are sealed by fear, unwilling to seek advice, is damned." ?
He means that any king, or anyone, who refuses to listen and take the advice of others will suffer serious consequences. This also foreshadows what happens to Creon at the end of the play.