How do we know the devil's power is limited?

Satan's power is inherently limited compared to God's unlimited sovereignty. While the devil operates with a degree of authority as the god of this world, he is constrained by God's sovereignty. For example, in the book of Job, God permits the devil to afflict Job, but it is under strict limits (Job 1:12). This reflects that while Satan can influence and tempt, he cannot act beyond the boundaries set by God. Therefore, any perception of Satan as an omnipotent force is fundamentally flawed; he is, in fact, a created being with restricted capabilities.