Contradiction with Proverbs 15:2
Proverbs 15:2 states that the tongue of the wise uses knowledge rightly, which contrasts with Proverbs 26:7 suggesting that a parable in the mouth of fools is useless.
Proverbs 15:2: The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness. [poureth: Heb. belcheth, or, bubbleth]
Contradiction with Ecclesiastes 10:12
Ecclesiastes 10:12 says that the words of a wise man's mouth are gracious, conflicting with Proverbs 26:7, which implies that fools cannot convey wisdom effectively.
Ecclesiastes 10:12: The words of a wise man's mouth [are] gracious; but the lips of a fool will swallow up himself. [gracious: Heb. grace]
Contradiction with Psalms 37:30
Psalms 37:30 indicates that the mouth of the righteous speaks wisdom, which contrasts with Proverbs 26:7's implication that wisdom from a fool is ineffective.
Psalms 37:30: The mouth of the righteous speaketh wisdom, and his tongue talketh of judgment.
Contradiction with Proverbs 10:31
Proverbs 10:31 suggests the mouth of the righteous brings forth wisdom, opposing Proverbs 26:7's notion that fools cannot deliver wisdom properly.
Proverbs 10:31: The mouth of the just bringeth forth wisdom: but the froward tongue shall be cut out.
Contradiction with Proverbs 11:30
Proverbs 11:30 claims that he who wins souls is wise, implying effectiveness in speech, contradicting the uselessness implied in Proverbs 26:7 for fools’ parables.
Proverbs 11:30: The fruit of the righteous [is] a tree of life; and he that winneth souls [is] wise. [winneth: Heb. taketh]