Any service you offer the Lord on earth is very important, including your usual attendance of church services. But if you do not have the Holy Spirit of the Lord in you, you do not belong to Christ (Romans 8:9). The power of God is His Holy Spirit, our seal of Salvation as believers(Eph. 1:13-14), and the power that anoints for true christian services. The things you do must be inspired from your heart by the Holy Spirit living in you, or they will amount to nothing before God in eternity.