Contradiction with 1 John 2:15-16
Proverbs 31:18 commends wise trade, whereas 1 John cautions against worldly desires.
1 John 2:15-16: Love not the world, neither the things [that are] in the world. If any man love the world, the love of the Father is not in him.
Contradiction with Matthew 6:19-21
Proverbs 31:18 values enterprise, Matthew emphasizes storing treasures in heaven, not on earth.
Matthew 6:19-21: Lay not up for yourselves treasures upon earth, where moth and rust doth corrupt, and where thieves break through and steal:
Contradiction with Luke 12:15
Proverbs 31:18 praises profitable work, while Luke warns against covetousness and valuing possessions.
Luke 12:15: And he said unto them, Take heed, and beware of covetousness: for a man's life consisteth not in the abundance of the things which he possesseth.
Contradiction with 1 Timothy 6:10
Proverbs 31:18 sees worth in profit, but 1 Timothy warns of the love of money being the root of evil.
1 Timothy 6:10: For the love of money is the root of all evil: which while some coveted after, they have erred from the faith, and pierced themselves through with many sorrows. [erred: or, been seduced]
Contradiction with Ecclesiastes 5:10
Proverbs 31:18 appreciates gain, while Ecclesiastes suggests that wealth doesn't satisfy.
Ecclesiastes 5:10: He that loveth silver shall not be satisfied with silver; nor he that loveth abundance with increase: this [is] also vanity.