Sheikh Saadi (Rah), the author of the world-famous book Gulistan, shares an incident about himself:
“One day, during the time of Tahajjud (late-night prayer), I woke up and was reciting the Quran. My father was engaged in Dhikr (remembrance of Allah). The rest of my family members were asleep at that time. Looking at them sleeping, a sense of pride arose in my heart.
I said to my father, ‘Look at them, sleeping like corpses without any desire to worship.’
Angered by my words, my father rebuked me, saying: ‘If you wake up early in the morning only to find faults in others, it would be much better for you to sleep like them!'”