15 And what accord has Christ with Belial? Or what part has a believer with an unbeliever?
15 And what accord [harmony] has Christ with Belial?
“Belial” is Satan. The Old Testament idea of “Belial” was a worthless person. The Greek thought is a lawless person. Satan is the most worthless and lawless of anyone. There can be no harmony between the two heads of their spiritual groups, between Christ and Satan.
The word “accord” is a musical term conveying the idea of harmony. Life outside Christ is a cacophony of noise. There is no harmony between Christ’s followers and the followers of Belial. Thus, Christ and Satan (Belial) have nothing in common.
Unbelievers and believers do not share the same authority.
The heads of the two kingdoms of the world, Christ and Belial (Satan), hold opposing worldviews. That creates fundamental antagonism between them; there is no possibility of cooperation of values between them. If that happened, that would mean that Christ would share in the worthlessness of Satan. Unbelievers cannot share in God’s promises.