Meaning of 斩钉截铁

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zhǎn dīng jié tiě (Trad.: 斬釘截鐵)
lit. to chop the nail and slice the iron (idiom); fig. resolute and decisive; unhesitating; categorical
Example Sentences
But I' ll never feel clean and I' ll never be able to assert that I have been a good man all my life.