Do not ever let your lack of composure, aka impulsive emotions, speak for you.  Words and reactions can be sharper than knives causing both temporary and permanent wounds. If deep enough, some wounds do not heal. 
Your emotions are the trigger for engaging and controlling your composure. Sometimes your emotions give you bad information. Be smart, STOP think/breathe, seek input, make good decisions - the first time. Your ability to successfully manage your emotions/composure will directly impact your ability to lead people. 

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