Spiritual vs. Spirit-filled (Acts 19:1-20)
As Paul spends time in Ephesus, it becomes extremely clear that this city is in need of the Holy Spirit. Certain "disciples" did not know that the Holy Spirit existed, and other spiritual people were trying to invoke the name of Jesus without believing in Him.
The spiritual realm is real and can only be combated by the Spirit-filled. As disciples of Jesus, we have been given the gift of the Holy Spirit in us to guide us, empower us, and give us the wisdom we need to fight the spiritual battles we face on a daily basis.