Strongest Man ..

Prophet (PBUH) said :: The strong-man is not one who wrestles well but the strong man is one who controls his anger when he is in a fit of rage :: Sahih Muslim

LOUD VOICE

And be moderate (or show no insolence) in your walking, and lower your voice. Verily, the harshest of all voices is the voice (braying) of the ass." Quran (31:19)

INSULT

Nor defame one another, nor insult one another by nicknames:: Quran(49:11)

KIND SPEECH

Kind speech and forgiveness is better than charity followed by injury & Allah is self-sufficient and forbearing : Quran 2:263