Contradiction with John 8:44
This verse refers to deceit and falsehood, contrasting with John 18:37's emphasis on truth.
John 8:44: Ye are of [your] father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it. [of his own: or, from his own will or disposition]
Contradiction with Matthew 5:37
Advises letting 'Yes' be 'Yes,' and 'No,' 'No,' whereas John 18:37 focuses on Jesus' purpose to bear witness to the truth.
Matthew 5:37: But let your communication be, Yea, yea; Nay, nay: for whatsoever is more than these cometh of evil.
Contradiction with 1 John 1:8
Claims that denying sin within oneself is deceitful, countering John 18:37's claim of witnessing truth.
1 John 1:8: If we say that we have no sin, we deceive ourselves, and the truth is not in us.
Contradiction with Jeremiah 17:9
Describes the heart as deceitful, conflicting with the concept of bearing witness to the truth in John 18:37.
Jeremiah 17:9: The heart [is] deceitful above all [things], and desperately wicked: who can know it?
Contradiction with Romans 3:23
States that all have sinned, implying inherent fallibility, which clashes with the perfect truth-bearing role in John 18:37.
Romans 3:23: For all have sinned, and come short of the glory of God;