Diminishing wit through excessive joking
Nahj al-Balāgha|Volume 1|Book 3|Chapter 450
۴۵۰. وَقَالَ (عليه السلام): مَا مَزَحَ امْرُؤٌ مَزْحَةً إِلَّا مَجَّ مِنْ عَقْلِهِ مَجَّةً.
450. Amīr al-mu’minīn, peace be upon him, said: Whenever a man cuts a joke he separates away a bit from his wit.