Musar к Мишлей 7:13

He who has the trait of impudence commits sins in great quantities and yet considers himself righteous. And it is in this vein that we confess our sins by declaring, "We are not impudent and stiff-necked to say before Thee O Lord our Lord 'We are altogether righteous and we have not sinned.' " And this is a very wretched and evil quality — one who is wicked and yet says "I have not sinned." And for this the Holy One, Blessed is He, judges him and has no mercy upon him, as it is written: "Behold I will enter into judgment with you because you say 'I have not sinned' " (Jer. 2:35). And He has said: "He that covers his transgressions shall not prosper, but who so confesses and forsakes them shall obtain mercy" (Prov. 28:13). And this path of the hard and impudent is far indeed from the paths of repentance. And of the harlot it is said in Proverbs 7:13: "With an impudent face she said to him…". This quality is very evil, for it brings man to shaming his companion and the poor, as it is said: "The poor pleads but the rich answer impudently" (Prov. 18:23). And how much more evil is it when he shames his teachers and acts impudently towards them, and hardens his neck to those who rebuke him because of his excessive rudeness — then this evil quality can remove him from the world. It is proper that a man should far remove any touch of impudence from his soul.