Contradiction with James 3:8
This verse mentions that no man can tame the tongue and it is full of deadly poison, contradicting Proverbs 10:31's implication of wisdom and discretion in speech.
James 3:8: But the tongue can no man tame; [it is] an unruly evil, full of deadly poison.
Contradiction with James 3:2
This verse implies everyone stumbles with their words, contrasting with the righteous speech in Proverbs 10:31.
James 3:2: For in many things we offend all. If any man offend not in word, the same [is] a perfect man, [and] able also to bridle the whole body.
Contradiction with Ecclesiastes 10:12
This verse suggests that not all gracious lips escape trouble, which can contradict the upright speech depicted in Proverbs 10:31.
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 Job 27:4-6
Despite being righteous, Job acknowledges times when his speech might not have been upright or faultless.
Job 27:4-6: My lips shall not speak wickedness, nor my tongue utter deceit.