Contradiction with Matthew 7:21
This verse emphasizes that not everyone who acknowledges Christ will enter the kingdom of heaven, potentially contrasting with the assurance of truth and confidence before God in 1 John 3:19.
Matthew 7:21: Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
Contradiction with James 2:14
This verse highlights the necessity of works along with faith, which might contradict the assurance of being "of the truth" merely by actions of the heart and confidence before God mentioned in 1 John 3:19.
James 2:14: What [doth it] profit, my brethren, though a man say he hath faith, and have not works? can faith save him?
Contradiction with Hebrews 10:26
This verse warns about the consequences of willful sin after receiving knowledge of the truth, which might contradict the reassurance and confidence in the heart before God found in 1 John 3:19.
Hebrews 10:26: For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins,
Contradiction with 1 Corinthians 10:12
This verse advises caution and mindfulness even when one feels secure, which could be seen as contradicting the sense of reassurance and confidence in being "of the truth" highlighted in 1 John 3:19.
1 Corinthians 10:12: Wherefore let him that thinketh he standeth take heed lest he fall.
Contradiction with Jeremiah 17:9
This verse describes the heart as deceitful, which seemingly contradicts the reliance on one's heart to reassure us of being "of the truth" in 1 John 3:19.
Jeremiah 17:9: The heart [is] deceitful above all [things], and desperately wicked: who can know it?