Genuine evangelical contrition – as opposed to legalistic, fearful sadness simply owing to threats – is a sorrow for not having holiness. But now you have to be careful here. It is possible to weep over not having holiness not because you love God and want to enjoy all that He is for you in Christ but because you fear the punishment that comes for not having holiness. Many a criminal will weep when his sentence is read, not because he has come to love righteousness, but because his freedom to do more unrighteousness is being taken away. That kind of weeping is not true evangelical repentance. And it does not lead to radical Christian obedience.
John Piper