True Repentance

Beware! Do not allow yourself to do what you know is wrong, relying on the thought, "Later I will repent and ask God's forgiveness."
True repentance flashes remorse and rains tears, for which lightning and clouds are needed, just as warmth and rain are needed to produce fruit. Without the lightning of the heart and the rain clouds of the eyes, How can the fire of divine wrath be calmed? How shall the greenery grow and fountains of clear water pour forth?
Masnawi, Volume II:1652-6