The author said, "There is good guilt. The kind that drives a repented person to his (her) knees. The guilt that says, "I'm sorry, please forgive me." Such guilt promotes grace."
The guilt that measures spirituality by external appearances. Such guilt paralyzes grace.
The first is a tool of God and the other of Satan. Once seeks grace, the other snatches grace. One feels like liberty, the other legalism.