clean-up operations

John Piper in The Danger of Being Merely Human:

A deep spiritual walk with God does not usually happen immediately after conversion. When the Holy Spirit invades the enemy territory of our lives and sets up Jesus Christ as King in the capital city of our heart, his strategy for conquering the rebel forces of the flesh that keep up their guerrilla warfare is different for each person. It may be fast or slow. God’s clean up operations are very strange.

(via)