Contradiction with Proverbs 25:17
This verse advises against frequent visits to a neighbor, which can be seen as contradicting the close companionship and counsel mentioned in Proverbs 27:9.
Proverbs 25:17: Withdraw thy foot from thy neighbour's house; lest he be weary of thee, and [so] hate thee. [Withdraw...: or, Let thy foot be seldom in] [weary...: Heb. full of thee]
Contradiction with Proverbs 14:10
This verse states that the heart knows its own bitterness, suggesting solitude in one's feelings rather than finding sweetness in a friend's counsel.
Proverbs 14:10: The heart knoweth his own bitterness; and a stranger doth not intermeddle with his joy. [his own...: Heb. the bitterness of his soul]
Contradiction with 1 Thessalonians 4:11
Encourages leading a quiet life and minding one's own business, which can contradict seeking or relying on others’ counsel as in Proverbs 27:9.
1 Thessalonians 4:11: And that ye study to be quiet, and to do your own business, and to work with your own hands, as we commanded you;
Contradiction with Proverbs 18:1
It suggests that a person who isolates themselves seeks their own desires, which can be at odds with the positive portrayal of friendship and counsel in Proverbs 27:9.
Proverbs 18:1: Through desire a man, having separated himself, seeketh [and] intermeddleth with all wisdom. [Through...: or, He that separateth himself seeketh according to his desire, and intermeddleth in every business]