text: Many tend to hide their true feelings simply because they do not want others to know their true emotions. To read students' emotions in that way is an invasion of one's privacy. When people are sad, they hide that feeling because they either do not want to think about what is making them sad, or becuase they do not want to make the people around them sad as well. Reading the facial expressions of people, especially those who conceal their emotions, is similar to reading one's thoughts, which invades their private thoughts and emotions. When some one is hiding their emotions, that is their private feeling and should not be shared nor invaded unless with permission granted by that person.