Polishing your heart
Source:The Invocation of God
Doubtless, a heart grows tarnished like brass or silver, and its polish is by remembrance, which may make it shine like a crystal mirror. So when one neglects the remembrance it tarnishes, and when he returns it shines. Since the heart is tarnished by two things: heedlessness and sin. And it is polished by two things: remembrance and asking forgiveness.
- Ibn al-Qayyim