You may be intelligent, articulate, strong willed and punch like Mike Tyson but if you loose your temper easily, you can be manipulated in many circumstances by much weaker adversaries. To borrow from Pirke' Avot, a favorite source of mine:
Who is strong? He who subdues his impulses.
Note: Be aware that many variant translations exist in English but the Hebrew is roughly contemporary with cannonization of the Pentateuch and poses a few challenges to the modern reader.