The lawgiver would, in fact, do a better job if he divided ignorance into two: 'simple' ignorance, which he would treat as the cause of trivial faults, 'double' ignorance, which is the error of a man who is not only in the grip of ignorance but on top of that is convinced of his own wisdom, believing that he has a thorough knowledge of matters of which, in fact, his ignorance is total.