"The first tradition is reported from Imam Ja’far as-Sadiq (A): He said, 'There is no man who does not have a white spot in his heart. When he commits a sin a black spot emerges from this spot. If he repents, the blackness goes away but if he sinks in sin and continues to sin the blackness keeps on increasing till it surrounds the whiteness of the heart completely. When the white spot is totally covered by the blackness, the owner of this heart will never revert towards goodness.'"

AYATOLLAH DASTAGHAIB SHIRAZI (R)