Since the Fall of Adam, God has temporarily granted Satan permission to govern this world (Matt. 4:8-9; John 12:31; 14:30; 16:11; 2 Cor. 4:4; Eph. 6:12; 1 John 5:19). Satan, and those who follow him (both demons and people), are ultimately under God’s sovereign control, and even their evil plans and actions are used for His good purposes (Gen. 50:20; Ps. 76:10; Job 1:6-12; Acts 2:22-23; 4:27-28; Rom. 8:28; 2 Cor. 12:7-10). Satan governs by means of a system he’s created, which Scripture calls the κόσμος kosmos. The world, or world-system, consists of those philosophies, values and practices that influence humanity to think and behave contrary to God and His Word.
- "The kosmos is a vast order or system that Satan has promoted which conforms to his ideals, aims, and methods. It is civilization now functioning apart from God-a civilization in which none of its promoters really expect God to share; who assign to God no consideration in respect to their projects, nor do they ascribe any causality to Him. This system embraces its godless governments, conflicts, armaments, jealousies; its education, culture, religions of morality, and pride. It is that sphere in which man lives. It is what he sees, what he employs. To the uncounted multitude it is all they ever know so long as they live on this earth. It is properly styled “The Satanic System” which phrase is in many instances a justified interpretation of the so-meaningful word, kosmos."
Satan’s world-system is not changeable and cannot be modified to conform to God’s will. At the core of Satan’s world-system is a directive for mankind to function apart from God. Worldly-minded persons embrace Satan’s system and love their own because they share the same values of selfishness that exclude God. By promoting the gospel and biblical teaching, Christians disrupt Satan’s kingdom by calling out of it a people for God. When a person comes to Christ for salvation, they are transferred from Satan’s kingdom of darkness to the kingdom of God’s Son (Acts 26:18; Col. 1:13-14), and become ambassadors for Christ (2 Cor. 5:20). The lifetime of worldly thinking that shaped our values and behaviors are not suddenly eradicated at the moment of salvation. Rather, God calls us to be transformed in our thinking by renewing our minds and living by faith in His Word (Rom. 12:1-2). Though Christians have the capacity, we are not to love the world (John 16:33; 17:14-16; 1 John 2:15). The Christian who loves the world makes himself the enemy of God (Jam. 4:4). Those who love God and His Word share a mutual love for each other. By learning God’s Word, Christians can identify worldly conversations and either avoid them or disrupt them by interjecting biblical truth. This should be done in love and grace (Eph. 4:15; Col. 4:6), not by argumentation (2 Tim. 2:24-26). When we learn God’s Word, obey His commands, and show love to others, we are rebelling against Satan’s world-system and sowing the seeds of spiritual insurrection in the lives of those who live and walk in Satan’s kingdom.
 Lewis S. Chafer, “Angelology Part 4” Bibliotheca Sacra 99 (1942): 282-283.