As long as people are alive, emotions has always been there. It's the basic part of human nature. To fully realize your potential and capabilities, understanding your emotions is a must.
Because, how many of us has made a bad decision when we are angry? If you said no, you're a saint. How many times have we just felt lazy and ignore important responsibilities?
My point here is emotions is integrated in our decisions & actions. Without understanding how your own emotions work together, the quality of your decisions and life fluctuates drastically.
Also, your ability to understand other people's emotion becomes limited as well. In this video, I talk about the 6 primary emotions and what emotions actually mean to us.
Primary Emotions - Understanding Yourself