G. I. , "Beelzebub's Tales to His Grandson"So-and-so-and-so-must-be; do-not-do-what-must-not-be. Mullah's favorite saying. p. 598 - Gurdieff
All humans are dead except those who have knowledge; and all those who have knowledge are asleep, except those who do good deeds;and those who do good deeds are deceived, except those who are sincere;and those who are sincere are always in a state of worry. (rahimullah) - Imam Shafi’i