Allamah Isfaraini (Rahimahullah), the teacher of Imam Ghazali (Rahimahullah) supplicated for thirty years to Allah to make him sinless. He wanted to be completely free from all types of sin. This was a special status he sought. Only the one who does not want to displease Allah can make such a dua. One day he thought that although he had been supplicating for thirty years, Allah had not accepted his dua despite being Karim (generous in giving).