What does the Bible say about spiritual authority?

In Acts 19, we see a clear demonstration of spiritual authority when the vagabond Jews attempt to use the name of Jesus without having a personal relationship with Him. The evil spirit recognizes Jesus and Paul, but questions their authority, showing that mere invocation of names without genuine faith is impotent. This underscores that true spiritual authority is derived from an authentic relationship with Christ, as indicated in passages such as Ephesians 1:19-23, where the power of God is at work in believers.