2 Corinthians 6:11-15

We are speaking freely to you, Corinthians [we are keeping nothing back], and our heart is opened wide. [Is 60:5; Ezek 33:22] There is no limit to our affection for you, but you are limited in your own affection [for us]. Now in the same way as a fair exchange [for our love toward you]—I am speaking as [I would] to children—open wide [your hearts] to us also. Do not be unequally bound together with unbelievers [do not make mismatched alliances with them, inconsistent with your faith]. For what partnership can righteousness have with lawlessness? Or what fellowship can light have with darkness? What harmony can there be between Christ and Belial (Satan)? Or what does a believer have in common with an unbeliever?