Contradiction with Proverbs 3:5
Encourages trust in the Lord, whereas Isaiah 31:6 urges returning to the Lord after straying.
Proverbs 3:5: Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Contradiction with Matthew 7:13-14
Describes a narrow path to life, contrasting Isaiah 31:6's call for return, implying divergence rather than convergence.
Matthew 7:13-14: Enter ye in at the strait gate: for wide [is] the gate, and broad [is] the way, that leadeth to destruction, and many there be which go in thereat: [strait: or, narrow]
Contradiction with James 1:8
Suggests double-mindedness is unstable, conflicting with Isaiah 31:6's straightforward call to return.
James 1:8: A double minded man [is] unstable in all his ways.
Contradiction with Hebrews 6:4-6
Warns it is impossible to renew those who fall away, contrary to the hopeful return in Isaiah 31:6.
Hebrews 6:4-6: For [it is] impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost,
Contradiction with Romans 11:29
States God's gifts and calling are irrevocable, contradicting the implication of turning back in Isaiah 31:6.
Romans 11:29: For the gifts and calling of God [are] without repentance.