A chiasm is a literary structure where vocabulary of the first section of a passage is repeatedin the second. The center of the chiasm is typically the climax of the passage. In 2 Corinthians 6:14-15 the center and climax is three reasons not to be bound with unbelievers: for what partnership have righteousness and lawlessness, or what fellowship has light with darkness? Or what harmony has Christ with Belial? (2 Cor 6:14b-15a). 2 Corinthians 6:15 adds a fourth reason, “or what has a believer in common with an unbeliever?” (2 Cor 6:15b).