Contradiction with Matthew 18:16
This verse also aligns with 2 Corinthians 13:1 in affirming the necessity of witnesses, thus not providing a contradiction.
Matthew 18:16: But if he will not hear [thee, then] take with thee one or two more, that in the mouth of two or three witnesses every word may be established.
Contradiction with John 8:17
Another verse that confirms the principle laid out in 2 Corinthians 13:1 rather than contradicting it, as it likewise upholds the testimony of two witnesses.
John 8:17: It is also written in your law, that the testimony of two men is true.
Paradox #1
The possible contradiction in 2 Corinthians 13:1 could be related to the idea of requiring multiple witnesses to establish a fact or claim. This might conflict with the value of truthfulness and honesty, where ideally, one truthful testimony should be enough. Some might see an inconsistency between the legalistic requirement for multiple witnesses and the emphasis on individual honesty and integrity.