In revival, God is not concerned about filling empty churches, He is concerned about filling empty hearts.
The first essential for the coming of the Holy Ghost into a heart today is that the heart should be cleansed from sin, for the Holy Spirit does not fill an unclean heart. What God has cleansed, He then fills. Finally, whom God fills, He uses. A holy life is the authentic sign of being filled with the Spirit.
Nobody else can give you a clean heart but God.
Satan fools and feigns, blows and bluffs, and we so often take his threats to heart and forget the "exceeding greatness of God's power to us.