Contradiction with Proverbs 11:2
Proverbs 3:18 speaks of wisdom as a tree of life and a positive guide, whereas Proverbs 11:2 mentions that with pride comes shame, which implies that not all wisdom (often associated with human pride) is beneficial or life-giving.
Proverbs 11:2: [When] pride cometh, then cometh shame: but with the lowly [is] wisdom.
Contradiction with Ecclesiastes 1:18
Proverbs 3:18 describes wisdom as life-giving and peaceful. In contrast, Ecclesiastes 1:18 suggests that with increased wisdom comes grief and sorrow, contradictory to the positive attributes.
Ecclesiastes 1:18: For in much wisdom [is] much grief: and he that increaseth knowledge increaseth sorrow.
Contradiction with Isaiah 29:14
Proverbs 3:18 praises wisdom as beneficial, yet Isaiah 29:14 talks about God doing wonders by causing the wisdom of the wise to perish, implying it may not always be beneficial.
Isaiah 29:14: Therefore, behold, I will proceed to do a marvellous work among this people, [even] a marvellous work and a wonder: for the wisdom of their wise [men] shall perish, and the understanding of their prudent [men] shall be hid. [proceed: Heb. add]
Contradiction with 1 Corinthians 1:19
Proverbs 3:18 suggests wisdom is desirable, but 1 Corinthians 1:19 indicates that God will destroy the wisdom of the wise, implying it can be futile.
1 Corinthians 1:19: For it is written, I will destroy the wisdom of the wise, and will bring to nothing the understanding of the prudent.