“Once I asked Abu ‘Abdillah (a.s.) ‘Is it possible that at one time a man supplicates and it is accepted and then is delayed for a period of time?’ The narrator has said that the Imam then said, ‘Yes, it can happen.’ I then asked, ‘Why is that? Is it because so he will increase his supplication and pleading?’ The Imam said, ‘Yes, that is right.’”