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Who states,...take these things to heart, my son, I warn you. All men make mistakes, it is only human. But once the wrong is done, a man can turn his back on folly, misfortune too, if he tries to make amends...Stubbornness brands you for stupidity---pride is a crime." And, what is he referring to
What is the speaker is Tiresias and he is talking to Creon about his mistake of not burying the body and he can still make amends/changes to his mistake. He must listen to others and not be so hubris.