2 Corinthians 6:15

Concord. Gr. sumphōnēsis, “concord,” “agreement.” Concerning the related word sumphōnia see on Luke 15:25. Between Christ and Satan there is utter discord.

Belial. Gr. Belial, a transliteration from the Heb. beliya‘al, “worthless one” (see on Deut. 13:13; Judges 19:22; 1 Sam. 2:12). However, textual evidence favors (cf. p. 10) the reading Beliar. The reading Belial appears only in few late manuscripts and probably entered KJV by way of the Latin Vulgate. Here the word is a personification for Satan, representing the worthlessness and emptiness of the things by means of which he seeks to attract and lure men into sin. It is also used of the followers of Satan (Deut. 15:9, margin; 1 Sam. 25:25; 30:22; Ps. 41:8, margin). Christ and Belial are the opposing leaders in the great controversy between righteousness and unrighteousness (Rev. 12:7–9; cf. ch. 20:7–9). Sin is not an abstract thing. Back of all that is true, holy, and righteous are the supernatural forces of the universe led by Christ. Back of all that is evil and worthless are the supernatural forces of darkness led by Satan. All the world is lined up behind one or the other (1 Peter 5:8–9; Rev. 12:11).

Man’s choice between these two world rulers must be clear and decided. Christ is the Prince of light (John 1:9; 8:12). His followers are called the children of light (Matt. 5:14; John 12:36; Eph. 5:8). They walk in the light, and their destiny is the city of light, where there is no darkness at all (John 12:35, 36; 1 Thess. 5:4, 5; 1 John 1:5–7; Rev. 22:5). Satan is the prince of darkness (Col. 1:13). His followers are the children of darkness (John 3:19; Eph. 5:11). They walk in darkness now, and their destiny is eternal darkness (Matt. 22:13; 25:30; 2 Peter 2:17; 1 John 1:6; Jude 13).