Contradiction with Jeremiah 31:34
John 13:18 suggests predestination, whereas Jeremiah 31:34 indicates that all will know the Lord without exception.
Jeremiah 31:34: And they shall teach no more every man his neighbour, and every man his brother, saying, Know the LORD: for they shall all know me, from the least of them unto the greatest of them, saith the LORD: for I will forgive their iniquity, and I will remember their sin no more.
Contradiction with 2 Peter 3:9
John 13:18 implies a selective fulfillment, while 2 Peter 3:9 suggests that God is patient, not wanting anyone to perish but all to come to repentance.
2 Peter 3:9: The Lord is not slack concerning his promise, as some men count slackness; but is longsuffering to us-ward, not willing that any should perish, but that all should come to repentance.
Contradiction with 1 Timothy 2:4
John 13:18 indicates specific selection, while 1 Timothy 2:4 expresses God's desire for all men to be saved and to come to the knowledge of the truth.
1 Timothy 2:4: Who will have all men to be saved, and to come unto the knowledge of the truth.
Contradiction with Matthew 23:37
John 13:18 implies a predetermined outcome, yet Matthew 23:37 speaks to Jesus's longing to gather Jerusalem’s children, suggesting human resistance to divine will.
Matthew 23:37: O Jerusalem, Jerusalem, [thou] that killest the prophets, and stonest them which are sent unto thee, how often would I have gathered thy children together, even as a hen gathereth her chickens under [her] wings, and ye would not!
Paradox #1
John 13:18 might be seen as having a theological inconsistency when considering the concepts of free will and predestination. The verse implies a fulfillment of Scripture through actions that seem predetermined, which can raise questions about Judas’s free will in betraying Jesus. Some might wonder how Judas can be held morally accountable if his actions were foreseen and necessary to fulfill prophecy. This tension between divine foreknowledge and human free will can be seen as a theological conflict.