Contradiction with Jeremiah 17:9
This verse suggests the heart is deceitful and desperately wicked, contrasting with Romans 8:27's implication that God knows the heart in a positive, guided sense.
Jeremiah 17:9: The heart [is] deceitful above all [things], and desperately wicked: who can know it?
Contradiction with 1 Samuel 16:7
God looks on the heart instead of outward appearance, contrasting Romans 8:27 where God knows the mind of the Spirit, suggesting a deeper spiritual understanding rather than just appearance.
1 Samuel 16:7: But the LORD said unto Samuel, Look not on his countenance, or on the height of his stature; because I have refused him: for [the LORD seeth] not as man seeth; for man looketh on the outward appearance, but the LORD looketh on the heart. [outward...: Heb. eyes]
Contradiction with Proverbs 28:26
Claiming trust in one's heart is foolish, opposing the idea in Romans 8:27 that suggests a positive aspect to knowing the heart.
Proverbs 28:26: He that trusteth in his own heart is a fool: but whoso walketh wisely, he shall be delivered.