If I try to spend the spiritual power without first mining it I may end up like the disciples who tried to cast out the demon but couldn't for lack of prayer and fasting; or worse the folks in Acts 16 who invoke the name of Jesus against a demon and end up beaten and naked.
“He has made everything beautiful in its time. Also, He has put eternity into man’s heart, yet so that he cannot find out what God has done from the beginning to the end.” —Ecclesiastes 3:11
The song of the early church in unison displayed the mighty power and the healing fruit of the Holy Spirit.