Pain is one of the basic human emotions, coupled with fear, anger, disgust, joy and surprise. Emotional state caused by a decline of morals. It is the expression of emotional pain through tears, the face shot, lack of appetite, etc.. We often feel sad when our expectations are not met, when the circumstances of life are more painful happy.

~~Usually when people are sad, they do nothing. Limited to mourn. But when his grief becomes indignation, are able to change things~~