Contradiction with Proverbs 17:10
Proverbs 17:10 suggests that a wise person learns from a single rebuke, contrasting with Proverbs 21:11 where the simple learn wisdom from the punishment of the scorner.
Proverbs 17:10: A reproof entereth more into a wise man than an hundred stripes into a fool. [entereth...: or, aweth more a wise man, than to strike a fool an hundred times]
Contradiction with Proverbs 19:25
Proverbs 19:25 indicates that if you smite a scorner, the simple will beware and if you reprove one that has understanding, he will gain knowledge, highlighting a nuance in teaching the wise directly rather than through punishing others.
Proverbs 19:25: Smite a scorner, and the simple will beware: and reprove one that hath understanding, [and] he will understand knowledge. [will beware: Heb. will be cunning]
Contradiction with Ecclesiastes 7:5
Ecclesiastes 7:5 states it is better to hear the rebuke of the wise than the song of fools, which contrasts with Proverbs 21:11's implication that witnessing punishment can be a more effective teacher.
Ecclesiastes 7:5: [It is] better to hear the rebuke of the wise, than for a man to hear the song of fools.