too much temper can cloud reason

Evaluate the ways in which emotion might enhance and/or undermine reasoning as a Way of Knowing.

The Godfather once said, "too much temper can cloud reason." Which is exactly how i might have answered this question. Emotion is the key to reasoning or how someone learns and/or thinks. For example, a person with a bad temper would most likely avoid any type of contact with someone which means he would not have a chance to hear what the person has to say. If this is not making too much sense, maybe i should describe it better.
Here is a better example. Early Monday morning, Marcus wakes up from his sleep, he stretches and prepares for school. Thinking today is going to be a good day he wears his plain white tee shirt and some nice shoes. He gets to school and attends breakfast as usual in the cafeteria. He gets the pancakes and sits with his friends. He begins eating them and suddenly a piece of pancake falls onto his shirt. The syrup leaves a sticky stain he has to deal with for the entire day. Moments after that, someone ridicules him about the mess on his white tee and feeling humiliated he charges after him and a fight breaks out. A few periods later, he receives a text message from his girlfriend, "it's over". Marcus sits in his next class with his head down not paying attention to the valuable lesson that is being given during class because he is too busy thinking about all the events that occurred today.
The next day Marcus walks into class and the teacher gives the students a pop quiz! He fails miserably because he was too angry the previous day to completely register everything he was taught and did not have the opportunity to take notes.
Understand that Marcus is a student who participates actively in school and gets good grades. Imagine what the outcome would have been if the syrup, fight, and the break up would have never happened.
So when i say "too much temper can cloud reason" i mean all of the events which may have caused stress on an individual are still lingering around in ones mind leaving no room for the ability to reason.