Contradiction with Proverbs 3:5
Trust in the LORD with all thine heart; and lean not unto thine own understanding. Contradicts Isaiah 46:12's emphasis on the stubborn and unrighteous heart.
Proverbs 3:5: Trust in the LORD with all thine heart; and lean not unto thine own understanding.
Contradiction with Matthew 5:48
Be ye therefore perfect, even as your Father which is in heaven is perfect. Contradicts Isaiah 46:12 by urging perfection, whereas Isaiah calls out to the stouthearted.
Matthew 5:48: Be ye therefore perfect, even as your Father which is in heaven is perfect.
Contradiction with Romans 3:23
For all have sinned, and come short of the glory of God. Contradicts Isaiah 46:12 as it assumes an unrighteous nature rather than calling out specific unrighteousness.
Romans 3:23: For all have sinned, and come short of the glory of God;
Contradiction with James 4:8
Draw nigh to God, and he will draw nigh to you. Cleanse your hands, ye sinners; and purify your hearts, ye double minded. Offers a path to righteousness contrasting Isaiah's recognition of the unrighteous.
James 4:8: Draw nigh to God, and he will draw nigh to you. Cleanse [your] hands, [ye] sinners; and purify [your] hearts, [ye] double minded.
Contradiction with Jeremiah 17:9
The heart is deceitful above all things, and desperately wicked: who can know it? Contrasts Isaiah 46:12 by describing the inherent deceit, rather than stubbornness, of the heart.
Jeremiah 17:9: The heart [is] deceitful above all [things], and desperately wicked: who can know it?