Rending one's garments was the action of one experiencing distress. Such actions, however, might be only superficial. According to Joel, that which really needed rending was the heart. One could tear his garments into shreds and still not be right with God.
The basic need is the recognition of the guilt of sin and godly sorrow from a broken heart. Because of sin in his own life, David knew the kind of heart that pleases God.…