We commonly become emotional, either in times of sorrow—being separated from a loved one, experiencing failure in an external event, on hearing a piece of negative news, etc. or in times of joy—when our child or spouse or even pet performs a warm act while watching a movie, etc. We have always believed that it is absolutely normal or natural to become emotional. Some of us even believe that it is good to let go of our emotions and cry once in a while for it makes us lighter and stronger. But on a spiritual level, becoming emotional comes under the realm of dependencies, and dependencies always weaken us.
This is because when we become emotional, instead of influencing our self on our own, we allow something or someone outside our self to influence us. We bring that something or someone or some event outside our self, inside, in front of the eye of our mind, attach our self to it, and lose our self in it.