Contradiction with Jeremiah 17:9
While Proverbs 27:19 suggests that the heart reflects a true, mirroring aspect of man, Jeremiah 17:9 suggests that the heart is deceitful and not straightforward or reliable.
Jeremiah 17:9: The heart [is] deceitful above all [things], and desperately wicked: who can know it?
Contradiction with 1 Samuel 16:7
Proverbs 27:19 implies the heart reflects one's true nature, but 1 Samuel 16:7 states that humans look at outward appearance, while God considers the heart, emphasizing an unseen aspect.
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
Proverbs 27:19 highlights the heart as a reflection, but Proverbs 28:26 warns against trusting one's heart, suggesting it is misleading.
Proverbs 28:26: He that trusteth in his own heart is a fool: but whoso walketh wisely, he shall be delivered.
Contradiction with Matthew 15:19
Proverbs 27:19 gives a reflective, somewhat positive view of the heart, whereas Matthew 15:19 points out the evil thoughts and deeds emerging from the heart, indicating its corrupt potential.
Matthew 15:19: For out of the heart proceed evil thoughts, murders, adulteries, fornications, thefts, false witness, blasphemies:
Contradiction with Mark 7:21-23
Proverbs 27:19 views the heart as reflective, yet Mark 7:21-23 lists various sins originating from the heart, indicating it can harbor negative and harmful elements.
Mark 7:21-23: Thefts, covetousness, wickedness, deceit, lasciviousness, an evil eye, blasphemy, pride, foolishness: [covetousness...: Gr. covetousnesses, wickednesses]