Contradiction with Matthew 13:14
This verse speaks of people not understanding or perceiving, in contrast to John 10:21, where people are divided in their understanding of Jesus' words and miracles.
Matthew 13:14: And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive:
Contradiction with 1 Corinthians 1:18
Refers to the message of the cross as foolishness to those who are perishing, contrasting with the divided perception in John 10:21 about whether Jesus’ words are wise or from a demon.
1 Corinthians 1:18: For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.
Contradiction with John 7:12
Voices opinions labeling Jesus as a good man or as deceiving; this contrasts with John 10:21, where there is discussion specifically about a demon influence.
John 7:12: And there was much murmuring among the people concerning him: for some said, He is a good man: others said, Nay; but he deceiveth the people.
Contradiction with Luke 11:14-15
Some accuse Jesus of casting out demons by Beelzebub, the prince of demons, opposing the reaction in John 10:21 where some believe he cannot be demon-possessed.
Luke 11:14-15: And he was casting out a devil, and it was dumb. And it came to pass, when the devil was gone out, the dumb spake; and the people wondered.
Contradiction with John 8:48-49
The accusation of Jesus having a demon is directly addressed and denied by Jesus, offering a counterpoint to John 10:21 where people are debating this.
John 8:48-49: Then answered the Jews, and said unto him, Say we not well that thou art a Samaritan, and hast a devil?