In our daily life we can experience multiple emotional or mood changes based on the events that happen over the course of our day. However, some emotions lay deeper then just day-by-day changes. Some emotions have a deeper connection to you personally because of past events. For example, sadness can lie deeper than just a surface level emotion. If you have experienced something traumatic, it may stick with you for years and cause you to be sad for a long time whereas if you are happy it may not last as long as other, stronger emotions.