Hazrat Khallaf bin Houshab says: Hazrat Isa bin Maryam (peace be upon him) said to his helpers: O best people of the earth! Do not corrupt this (earth). Because whenever something becomes corrupt, it is reformed through the best thing. And know that there are two (undesirable) traits within you: (one is) laughing without reason, and (the other is) remaining asleep in the morning despite not staying awake at night.