He is a more impudent thief that robs openly, than he that steals privately. [ Proverb ]

It is an impudent kind of sorcery to attempt to blind us with the smoke without convincing us that the fire has existed. [ Junius ]

It is vain for you to expect, it is impudent for you to ask of God forgiveness on your own behalf, if you refuse to exercise this forgiving temper with respect to others. [ Hoadley ]

So long as thou art ignorant, be not ashamed to learn : he that is so fondly modest, not to acknowledge his own defects of knowledge, shall in time, be so foully impudent to justify his own ignorance; ignorance is the greatest of all infirmities, and, justified, the chiefest of all follies. [ Quarks ]

Before dinner men meet with great inequality of understanding; and those who are conscious of their inferiority have the modesty not to talk; when they have drunk wine, every man feels himself happy, and loses that modesty, and grows impudent and vociferous; but he is not improved; he is only not sensible of his defects. [ Johnson ]