The Effect of Arguing and Joking with Others

Imam Hasan al-Askari (peace be upon him):
لا تُمارِ فَيَذْهَبُ بَهاؤُكَ، وَ لا تُمازِحْ فَيُجْتَرَأُ عَلَيْكَ.
“Do not argue with others, for it will diminish your dignity and respect. Do not joke with others, for it will embolden them to disrespect you.”
Aʿyān al-Shīʿa 2: 41