Contradiction with James 3:10
While Proverbs 10:20 highlights the value of a righteous tongue, James 3:10 emphasizes the inconsistency of the tongue by acknowledging the same mouth can both bless and curse.
James 3:10: Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be.
Contradiction with Matthew 12:34
Proverbs 10:20 suggests the tongue of the just is of great value, whereas Matthew 12:34 points out that the mouth speaks from the abundance of the heart, which can be evil, implying potential contradiction in value.
Matthew 12:34: O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh.
Contradiction with Romans 3:13-14
This passage describes the human tongue as deceitful and full of cursing, contrasting with the depiction of the just tongue in Proverbs 10:20 as being like choice silver.
Romans 3:13-14: Their throat [is] an open sepulchre; with their tongues they have used deceit; the poison of asps [is] under their lips:
Contradiction with Proverbs 10:19
While Proverbs 10:20 attributes value to the words of the just, Proverbs 10:19 suggests that by speaking less, one is wise, implying that even good words could be less valuable if too many are spoken.
Proverbs 10:19: In the multitude of words there wanteth not sin: but he that refraineth his lips [is] wise.
Contradiction with Proverbs 18:21
This verse states that death and life are in the power of the tongue, suggesting potential harm or death, which contrasts with the idea of the tongue of the just being like choice silver.
Proverbs 18:21: Death and life [are] in the power of the tongue: and they that love it shall eat the fruit thereof.